I've learned that when you become a mom, you also become a lighter sleeper. I typically wake up to hungry "O o-o o o"s before the crying starts. One night, however, I was particularly exhausted (not that that is rare or anything) and he reached the crying stage before I woke. When Chris nudged me, I was patting myself on the chest. Apparently I dreamt the baby was lying on my chest and I was trying to calm him down.
I've learned that when infants pass gas, they dont skip a beat. Eating- no disruption. Playing on the mat- no interruption. But this morning, while dozing off, he tooted so loud that he startled himself.
I've learned that it's not easy to clean spit up out of a little ear.
I've learned that not all "0-3 months" clothes are the same size. And that babies do not enjoy trying them on to see if they fit yet.
I've learned that making eye contact with your baby for a whole twenty minutes while he nurses is not boring at all. In fact, I enjoy it immensely. I talk to him and sing to him and pray outloud for him about his character and future.
If you give your son a bath in the sink, you run the risk of him peeing on your coffee pot.
Four sets of pajamas is not too many. Expect to wash them as fast as you can and likely change them in the middle of the night. That goes for the baby's pajamas too. (As in expect spit up on both of you).
You'll need a nail brush to clean the diaper rash cream out from under your fingernails... daily.