Professor David Haig at Harvard University recently published a scientific paper on human evolution that proposes babies cry at night to keep their parents from having sex.

If a mother becomes pregnant while the baby is still breastfeeding, the new baby may compete for the breast milk, he said. Babies are therefore wired to wake up hungry at night and cry to delay the mother's ovulation.

The babies aren't consciously doing this. Prof. Haig said they're hardwired to do it. But if your marriage romance gets put on hold every time you have a baby, feel better -- it's supposed to happen!

Men, you're being baby blocked by EVOLUTION!