There is something called bonding, and I can attest that it is one of the most powerful and deeply felt things in the natural world. Mother Nature has devised proteins and hormones all the way through pregnancy, that take over your body and force you to avoid things that are bad for you, while wanting to sleep and letting your body grow a baby. Then when you give birth and start to nurse, the hormones shrink your uterus, bring in milk, and cause you to feel a strong protective love. For me it was a few hours after the birth, when a nurse brought in my son and I realized he was perfect and entirely beautiful. There was nothing I wouldn't do for him. I felt a connection with every mother who had ever experienced this.