So my husband and I have learned many things thus far, good and bad.. and believe me, we're still learning. You pick up on their cries; if they're tired, hungry, need a change, how he wants to be rocked, picked up etc.. and these are things that we did not know when he was born. You also learn what he likes and don't like. You also learn what you like, and what doesn't really work for you. Here is a list of my baby must-haves: