A new clue to whether a mother-to-be is carrying a boy or a girl -- it's how much she eats, not how much weight she gains, but how many calories she takes in every day.
Harvard researchers tracked the diets of 244 expectant moms and found those carrying boys ate an average of 200 more calories a day than those who were carrying girls. The researchers aren't sure how to explain the difference, but it was consistent.
The pregnant women carrying boys ate 10% more than those carrying girls. And they suspect the mom's extra appetite may be sparked by testosterone secreted from the baby boy.