Oh the things you forget.
First up: babies? Messy. There’s cradle cap and baby acne and spit up and everything to do with diapers – not to mention whatever things exist in neck folds (seriously, don’t look in there). You think you remember diapers, at least, and how many of them can require changing in the space of, say, one hour. You are wrong.
Sleep dep: harsh. Again, you think you remember, and you think you can maybe do better this time. You are mistaken on both counts. (Fun fact: posting on Facebook about how tired you are at roughly three days post-partum does not elicit the expected sympathetic noises from other moms, but rather a stream of one-ups rendered even more bewildering by the fact that you are so tired you actually literally can’t see straight.)
It takes time for the belly to disappear. I mean, you knew this, but for some reason you also expect to fit into your pre-preg jeans at 2 weeks pp, which: no.
Nursing: hurts. You remember this. What you don’t remember is that, in the first few weeks, when the baby latches it feels EXACTLY like she is clamping down with a mouthful of needles.
The other thing you have forgotten, maybe: it’s totally worth it.