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They may sleep less, be less physically active, and experience more stress. And then that weight is not always easy to lose once the baby is born.

For example, the average 6-foot tall man has gained 4.4 pounds in weight after becoming a father for the first time if he lived in the same house with his child. They divided the population into three groups: resident fathers (who live with their children), nonresident fathers...

Whether or not they lived with their kids, becoming a father was linked to around a four pound increase in weight over the study period, while remaining child-free was associated with a 1.4 pound weight loss for a six-foot-tall man. The researchers focused on their body mass index.