New York: Women getting pregnant between June and August can expect heavier and healthier babies than babies conceived in other less warm months, a new study has found.

According to Wired, the report by economists Janet Curre and Hannes Schwandt of Princeton University also discovered that May was the most unfavorable time to get pregnant, a daily reported.

Children conceived in May were 13 percent more likely to be born premature that can cause many health problems, including weaker immune systems and slower cognitive development.

Babies conceived from January through May had a gestation period a week shorter than average, but that increased again for June conceptions.

The survey made use of official birth data of all births in New Jersey, New York and Pennsylvania for the years between 1994 and 2006.