UNITED NEWS INTERNATIONAL (UNI) — It may pay to be a chip off the old block.

New research suggests babies born to single mothers are healthier when they reach their first birthday if they look like their dads.

A study recently published in the Journal of Health Economics said these babies spend more time with their fathers.

One study author said, “Those fathers that perceive the baby’s resemblance to them are more certain the baby is theirs, and thus spend more time with the baby.”

The study included over 700 single mothers and their babies.

Babies who looked like their dads spent an average of 2.5 days a month more with their fathers than those who didn’t.

Researchers judged a baby’s health based on how often they saw a doctor, how much time they spent in a hospital and how many asthma attacks they had.

Past studies have found babies fare better when both parents are involved in their care.