Breastfeeding has many benefits, and one of them is the fact that it can be a natural contraceptive. Don't bank on that though or you may end up pregnant with baby number two before baby number one is 9 months old. But it works ... a lot of the time. As with just about everything, however, there is a science behind this, and it has to do with an infant's competitiveness. Yes, even newborns have a competitive spirit, so says Professor David Haig, who authored a study published in Evolution, Medicine, and Public Health that says breastfed babies prevent pregnancy because they want mom all to themselves. There's more to the reason why.
There is an undeniable bond that occurs when breastfeeding, and it's that bond that baby wants to keep -- that's part of the reason breastfed babies wake every two hours to nurse, Haig says. And as this study points out, we need to listen to baby's "evolutionary response" and all the motives they have.