Every single baby guide book is 100% absolutely garbage. I encourage every single one of you that are about to have children to never EVER buy one. All they do is talk about the "average" baby, and you'll soon find that you and your spouse feel entirely inadequate because your baby isn't sleeping as much, eating as much, moving as much, interacting as much, etc.

What the books never tell you is that sure, there may be average numbers available, but the STANDARD DEVIATION is HUGE. No baby is average. My wife was convinced our first child had sleeping issues because he slept 2 hrs less than average. It turns out that's just who he is, he sleeps a lot less than most kids, but still at the bottom of the range of healthy. All it does is fuck with your head, so just take a cue from other parents around you.