Bodily Changes You Didn’t Know Fatherhood Could Trigger

Motherhood brings about a lot of changes in women – both physically and mentally. Interestingly enough, the same happens to men and they tend to develop what is known as a dad bod, which refers to a soft and round male body type. It is believed that once a man has found a mate and become a father, he doesn’t care much about maintaining his physique. However, there are several other reasons that cause a man’s body to change once he becomes a father. Let’s take a look at these reasons.

1. Hormonal Changes

Fatherhood triggers a drop in testosterone and increase in oxytocin


The fact that women experience hormonal changes during and post pregnancy is well known. However, living with a pregnant partner has been found to affect the hormone levels of men too. Here are the hormonal changes a new father tends to experience.

  • Drop in testosterone levels: As men transition into fatherhood, they are said to experience a drop in testosterone levels.1 Though the reasons behind this drop are unclear, it is believed to be nature’s way of keeping the man faithful to his partner. So, he stays close to her and the expected baby. This drop in testosterone levels may continue up to six months after the baby is born.
  • Rise in oxytocin levels: Oxytocin, a hormone that plays a crucial role in reproduction and social interaction, is often known as the love hormone as it is also released during rewarding and affectionate physical contact like hugging and kissing. Research has revealed that new fathers experience a remarkable increase in oxytocin levels after interacting with their newborns.2 Just like in mothers, the increased oxytocin levels help fathers bond with their babies as well as be protective of them and eager to provide for them.

2. Neurological Changes

Fatherhood results in neurological changes that help a new father become more emotionally responsive and develop parenting skills


Fathers who spend a lot of time with their partner and newborn child experience changes in the brain too. There is increased brain activity after the arrival of the infant, which is said to continue for at least six months. The following reasons contribute to such increased brain activity.

  • Increased gray matter in the hypothalamus: The hypothalamus is the part of the brain that is responsible for sensitivity among other functions. New fathers are said to experience an increase in gray matter, a major component of the central nervous system. As gray matter increases in the hypothalamus, it tends to make the person more affectionate, responsible, and adept at multitasking. This is one of the main reasons why men become more emotionally responsive once they start taking care of a baby.3
  • Growth of the prefrontal cortex: The prefrontal cortex is the part of the brain that is responsible for functions like planning and memory. When men attain fatherhood, this part of the brain is said to grow and enable new fathers to plan and naturally develop the skills needed for good parenting. Also, the neurons in this region have more receptors for the hormone vasopressin, which is essential for strengthening the bond between father and offspring.4

3. Behavioral Changes

Fatherhood causes men to become more patient and unintentionally overeat


Hormonal and neurological changes in new fathers trigger the following behavioral changes too. These behavioral changes further lead to physical changes.

  • Unintentional overeating: Men living with their pregnant partners tend to pick up their eating habits and often end up unintentionally overeating. Also, once the baby is born, the many lifestyle changes and abundant food tend to trigger frequent binging and snacking. This leads to weight gain and the development of the dad bod – the kind of physique with less muscle and more fat.5
  • Higher patience levels: Testosterone is usually associated with non-nurturing behaviors. However, when a man attains fatherhood, his testosterone levels drop, making him more inclined toward the needs of his baby. He also becomes less aggressive and more patient.6

Becoming a parent can be a highly rewarding experience but it also brings along with it bodily changes that are usually inevitable. It is important for both men and women to maintain a healthy weight even after the birth of their child. Though the dad bod is not extremely unhealthy, it doesn’t take long for the body to get completely out of shape and lead to other weight-related problems. So, a healthy diet and regular exercise should always be prioritized, even by new parents.