According to census figures, one in four dads takes care of his preschooler during the time the mother is working.

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1 Abrams, Douglas Carlton. (2002). Father Nature: The making of a modern dad. Psychology Today, March-April, According to census figures, one in four dads takes care of his preschooler during the time the mother is working. The number of children who are raised by a primary-care father is now more than 2 million and counting. According to the Families and Work Institute in New York City, fathers now provide three-fourths of the child care mothers do, up from one-half 30 years ago. Is Father Nurture Natural? According to popular perceptions, men are supposedly driven by their hormones (primarily testosterone) to compete for status, to seek out sex and even to be violent conditions hardly conducive to raising kids. Two new Canadian studies suggest that there is much more to masculinity than testosterone. While testosterone is certainly important in driving men to conceive a child, it takes an array of other hormones to turn men into fathers. And among the best fathers, testosterone levels actually drop significantly after the birth of a child. If manhood includes fatherhood, which it does for a majority of men, then testosterone is hardly the ultimate measure of masculinity. One of the studies suggests that fathers have higher levels of estrogen the well-known female sex hormone than other men. Men go through significant hormonal changes alongside their pregnant partners changes most likely initiated by their partner s pregnancy and ones that even cause some men to experience pregnancylike symptoms such as nausea and weight gain. It seems increasingly clear that just as nature prepares women to be committed moms, it prepares men to be devoted dads. The new studies have the potential to profoundly change our understanding of families, of fatherhood and of masculinity itself. Being a devoted parent is not only important but also natural for men. There is evidence that men are biologically involved in their children s lives from the beginning. Is Biology Destiny for Dads? It s well known that hormonal changes caused by pregnancy encourage a mother to love and nurture her child. But it has long been assumed that a father s attachment to his child is the result of a more uncertain process, a purely optional emotional bonding that develops over time, often years. Male animals in some species undergo hormonal changes that prime them for parenting. But do human dads? The two studies, conducted at Memorial University and Queens University in Canada, suggest that human dads do. Psychologist Anne Storey and her colleagues took blood samples from 34 couples at different times during pregnancy and shortly after birth. The researchers chose to monitor three specific hormones

2 because of their links to nurturing behavior in human mothers and in animal fathers. The first hormone, prolactin, gets its name from the role it plays in promoting lactation in women, but it also instigates parental behavior in a number of birds and mammals. Storey found that in human fathers, prolactin levels rise by approximately 20 percent during the three weeks before their partners give birth. The second hormone, cortisol, is well known as a stress hormone, but it is also a good indicator of a mother s attachment to her baby. New mothers who have high cortisol levels can detect their own infant by odor more easily than mothers with lower cortisol levels. The mothers also respond more sympathetically to their baby s cries and describe their relationship with their baby in more positive terms. Storey and her colleagues found that for expectant fathers, cortisol was twice as high in the three weeks before birth than earlier in the pregnancy. Biologist Katherine Wynne-Edwards, who conducted the research with Storey, explains that while cortisol is seen as the fight or flight hormone, it might more accurately be described as the heads-up-eyes-forward-something-really-important-is-happening hormone. It may help prepare parents for approaching birth. Cortisol levels normally increase in women as pregnancy advances; indeed, a cumulative rise in stress-hormone levels sets off labor and delivery. The third hormone, testosterone, is abundant in male animals during mating but decreases during nurturing. Research has shown that human males experience a surge in testosterone when they win sporting events and other competitions. In Storey s study, testosterone levels plunged 33 percent in fathers during the first three weeks after birth. Levels then returned to normal by the time the babies were four to seven weeks old. However brief the dip in testosterone, it may have effects that endure for the life of the child. According to University of California at Riverside psychologist Ross Parke, it may let the nurturing side of men come to center stage. The dip may set in motion the more-cooperative, less-competitive enterprise of parenting. By encouraging fathers to interact with their kids, this brief hormonal change might actually induce the bonding process. Estrogen and the Daddy Brain Wynne-Edwards and graduate student Sandra Berg designed another, just-published study to test Storey and Wynne-Edwards earlier findings, They measured the hormone levels of the fathers over a longer period of time and incorporated into the study a control group of men who had never had children. The control group was matched by age, season and time of day tested all of which can affect hormone levels. Finally, by using saliva samples instead of blood draws, they were able to test the fathers and the men in the control group much more frequently. In addition to confirming the earlier findings for testosterone reduction and cortisol change, the researchers also found that the fathers had elevated levels of estrogen. The increase started 30 days before birth and continued during all 12 weeks of testing after birth. Although estrogen is best known as a female sex hormone, it exists in small quantities in men, too. Animal studies show that estrogen

3 can induce nurturing behavior in males. Acting in the brain as well as in other parts of the body, estrogen in men, and testosterone in women, makes humans extremely versatile behaviorally. We spend an awful lot of time looking for differences between the sexes and trumpeting them when we find them, observes Wynne-Edwards, but our brains are remarkably similar, built from the same DNA. In fact, going into the study, Wynne-Edwards predicted that the daddy brain would use the same nerve circuits, triggered by many of the same hormones, as the mommy brain. If Mother Nature wanted to turn on parental behavior in a male, she reasoned, the easiest thing would be to turn on pathways already there for maternal behavior. The studies also found that a father s hormonal changes closely paralleled those of his pregnant partner. The Intimacy Effect The researchers believe that intimate contact and communication between partners may induce the hormonal changes that encourage a father to nurture his children. Storey explains, My best guess is that women s hormone levels are timed to the birth and men s hormone levels are tied to their partners. Exactly how this occurs is unknown. There may be actual physiological signals exchanged between partners in close contact, such as the transmission of pheromones. Similar to odors, pheromones are volatile chemical substances that animals constantly give off through their skin or sweat but that are undetectable. Pheromones can stimulate specific reactions especially mating in other animals. Think of a female dog in heat attracting all those barking mate dogs in the neighborhood. Classic studies show that menstruation is communicated, and synchronized, through pheromones among dorm mates in college. If women in dorms respond to one another s pheromones, then a man and a woman who share intimate space could certainly communicate chemical messages. These pheromones could biologically cue a man that his partner is pregnant and kick off the hormonal changes that prompt him to be a dad in deed as well as in seed. Pregnancy certainly could, in fact, be signaled. The level of intimacy within a couple seems to be a factor in how a mother s body chemically signals approaching birth to a father. All of the men tested were living with their pregnant partners. Emotional closeness may also generate hormonal changes, although this possibility was not examined in detail. Still, couples reported feeling closer to their partner if they were taking about the baby and sharing details about the pregnancy. Whether this is the cause or the result of hormonal changes remains unknown for now. But the intimacy effect and the subsequent hormonal shifts may also be the reason many men experience pregnancylike symptoms.

4 Honey, We re Pregnant When he is not taking care of Seamus, Hudnut treats both men and women in his practice. He recalls several patients who came to him complaining of such typical pregnancy symptoms as weight gain and nausea all of whom were men. He remembers one second-time father who knew that his wife was pregnant even before she told him; He started having morning sickness, just as he had during her first pregnancy. Pregnancy symptoms in men are actually more common than most people believe. Two studies found that approximately 90 percent of men experience at least one pregnancy-related symptom, sometimes severe enough to prompt an expectant father to seek medical help. According to a study reported in Annals of Internal Medicine, more than 20 percent of men with pregnant wives sought care for symptoms related to pregnancy that could not otherwise be objectively explained. Unfortunately, like pregnancy symptoms in women, there is little that can be done to make the symptoms go away except wait. Pregnancy symptoms in men, however well documented, are generally dismissed as being all in the father-to-be s head. Now it seems they may also be in his hormones. Storey and her colleagues found that the men who experienced more pregnancy symptoms actually had higher levels of prolactin They also had a greater reduction in testosterone after exposure to sounds of crying and other infant cues that simulated the experience of being with an actual baby. For men who feel nauseated or gain weight, no one yet knows for sure whether the changes in hormones are to blame. Surging hormones, however, have long been blamed for women s morning sickness and other pregnancy side effects. The fact that men also experience hormone changes suggests it is more than empathy that causes many of them to feel their partner s pain. Changed by a Child While it now seems a father may accompany his wife on her hormonal roller coaster during pregnancy, interacting with the baby may keep his hormones spinning even after the birth. It s no secret that hormone levels can change in response to behavior. Sex, sports and work success can all send testosterone production spiraling upward. Might not nurturing a child or conversely, the sight, sound and smell of a newborn also change fathers levels of testosterone? In the original study, the researchers asked couples to hold dolls that had been wrapped in receiving blankets worn by a newborn within the preceding 24 hours. (After their wives gave birth, fathers held their actual baby.) They listened to a six-minute tape of a real newborn crying and then watched a video of a baby struggling to breast-feed. The investigators took blood from the men and women before the test and 30 minutes later. What they found is startling: Men who expressed the greatest desire to comfort the crying baby had the highest prolactin levels and the greatest reduction in testosterone. And testosterone levels

5 plummeted in those men who held the doll for the full half-hour. Even though scientists have long observed changes in animal and human behavior as a result of shifting hormone levels, they do not yet understand exactly how hormones accomplish such change. The hormone-behavior link remains one of the great mysteries of the brain. Perhaps hormones stimulate more neuron connections in the part of the brain responsible for nurturing. Or perhaps hormones encourage neurons in nurturing pathways to fire more quickly. Wynne-Edwards thinks hormones might turn a two-lane pathway in the father s brain into a four-lane superhighway. A neural road expansion might make fathers better able to recognize the smell or sound of their baby. It might even act on smell receptors in the nose to mitigate the smell of a baby s dirty diaper. Countless are the ways in which hormones could influence a father s brain to be more responsive to his baby. Home on the Range Although testosterone may be the primary male sex hormone the new research makes it clear that other hormones are also significant, especially during the transition into fatherhood. Wynne-Edwards believes the new research is a validation of the experiences that men know they have had. It also goes a long way to bumping testosterone off its pedestal as the only hormone that is important to men. Parke believes that the research suggests something even more radical: Men are much more androgynous than we think. We have the capability to be aggressive and nurturing. The traditional view of men as predominantly aggressive really sells men short and denies their capability to experience the range of human emotions. The new research suggests that a man s hormones may play an important role in helping him experience this full range of emotions especially in becoming a loving and devoted dad. In fact, it offers the first evidence that to nurture is part of a man s nature. RELATED ARTICLE: The Daddy dividend. By Douglas Abrams Beyond birth and infancy, researchers are finding, a father s presence makes a big difference in a child s long-term development. Ross Parke, Ph.D., a psychologist at the University of California at Riverside, explains that children of involved fathers regulate their own emotions better. They also have better social skills than children whose fathers are not involved in their lives and have better success in school. It is clear that fathers affect their children s social, cognitive and emotional development, he says. A father s influence seems to come, at least in part, through the unique ways that fathers play and interact with their children, says Kyle Pruett, M.D., a child psychiatrist at Yale. Fathers are more likely to encourage their kids to tolerate frustration and master tasks on their own before they offer

6 help, he explains, whereas mothers tend to assist a fussing child earlier. More than any particular social or cognitive skill, however, a father s love and affection may be the most significant gift he can give his children, says Ronald Rohner, Ph.D., a psychologist-anthropologist at the University of Connecticut, who for the past 40 years has been studying the effects of father love on children s development. A father s love is often a significant buffer against depression, conduct problems and substance abuse, he finds. Children who experience their father s love are often more emotionally stable, less angry, have better self-esteem and have a more positive worldview, Rohner says, To his surprise, he discovered that father love is often as influential as mother love on a child s happiness and sense of well-being. Rohner and his colleagues reviewed 100 U.S. and European studies; their results can be found in the Review of General Psychology. Although researchers are just beginning to study the children of involved fathers, there is a mountain of research on the children of absent fathers. Those children are at a higher risk for school failure and dropout, drug use, teen pregnancy, delinquency and teen suicide. Fathers clearly play an important role in the psychological and social survival of their kids. RELATED ARTICLE: Hormones vs. culture. By Michael Lamb, National Institute of Child Health and Human Development The view that fathers are reluctant caregivers may be a thing of the past, New findings show that hormonal changes of parenting are not limited to mothers. The reason we haven t discovered the hormonal changes in human fathers before now lies in a combination of scientific progress and cultural change. Early studies on rats found that males could learn to become involved fathers after prolonged exposure to their pups but did not experience any hormonal changes. The fact that these reluctant dads could learn to nurture led to the so-called bonding hypothesis. It claimed that fathers, including human fathers, could learn to become competent caregivers. But changes in mothers work roles have forced a redefinition of fathers nurturing roles. When I began studying families in the mid-1970s, half the fathers had never changed a diaper. Now, most dads do diaper duty. A father s role is increasingly multifaceted. He is, ideally, a breadwinner, a coach, a moral guide, a source of love and inspiration. Here s the shocking news: In 90 percent of birds and the majority of fish, fathers care for the young. Mammals are the only major group of vertebrates in which mothers are more involved. Among mammals, 90 percent of fathers take off after conception or birth. But the offspring usually are either self-sufficient from the start or can survive with the sole care of the mother, So why should human dads stick around and burp a baby? It turns out there s a big evolutionary advantage for the kids who get coddled.

7 Father care seems to boost the chances of survival significantly for human babies. Born helpless and dependent, babies demand an enormous amount of care. Having two parents to provide food and protection increases the odds an infant will function well and make it to adulthood. Most children today survive physically whether or not they have an involved father. But this may not have always been the case. In hunter-gatherer cultures the presence of a father counted heavily. Even in advanced industrial societies, where food and physical survival are rarely the issue, social survival still is. Children who grow up without their fathers are at greater risk for everything from school failure to teen suicide. So why, if fathers have a hormonal connection to their children, aren t all fathers more involved dads? There are cultural scripts that have precluded fathers from being involved, observes Jay Belsky, Ph.D., a psychologist at the University of London. A generation ago fathers weren t allowed into birthing rooms and didn t change diapers. When social norms work against father involvement, hormones may have less of an effect on their actual behavior. Men have moderate to high contact with infants in only 40 percent of cultures, according to an international survey. In other words, humans aren t held in hormonal thrall research suggests that hormones simply facilitate a transition into fatherhood. The definition of that fatherhood will no doubt depend on culture. SAMPLE EXAM ITEMS ONE. fill in the blank. As reported by Abrams, according to the Family and Work Institute in New York City, fathers now provide of the child care as mothers do. a. just as much b. one-half c. one-fourth d. three-fourths e. one-third f. two-thirds TWO. As reported by Abrams, Storey's study found that men who experienced more pregnancy symptoms during their partner's pregnancy had higher levels of which of the following hormones? a. prolactin b. cortisol c. testosterone d. estrogen e. pheromones f. oxytocin THREE. As discussed by Abrams, as fathers change countless diaper, the father's smell receptors in his nose react in the following way:

8 a. they will be enhanced so fathers can better determine when diapers need changing b. they will be de-sensitized over time so dirty diapers won't have as much of an adverse effect as before c. they will remain the same d. they will become oversensitive so fathers are adversely affected by dirty diapers even more so than before