Fatherhood can make men fat, a new study has found. New dads gain an average of about 4.4 pounds after having kids, according to a Northwestern University study that kept track of weight changes among more than 10,000 men over 20 years. In comparison, the average man of the same height without kids actually lost 1.4 pounds during the same time period, found researchers for the study, published Tuesday in the American Journal of Men's Health. The extra poundage is likely due to parenthood’s new responsibilities — which leave less time to exercise — and compulsive dad habits like cleaning kids’ plates after every meal, researchers said. Pediatricians should counsel fathers about eating habits and exercise when they bring kids in for visits, the study advised. “These findings support the need for obesity prevention interventions specifically designed for and targeted toward young males in general and those transitioning to fatherhood in particular,” the authors wrote.