Letting a baby fuss in their crib for 5-10 minutes won’t kill them if you need to take a shit.
Start feeding them more than just milk/formula at 6-8 months.
They’re going to fall and hurt themselves a lot, kids bounce.
Kids feel your energy and reflect it like a mirror, and they hear fucking EVERYTHING you say when when you don’t see them.
Saying “no” is a good thing, kids actually crave structure, and rules create structure. And tantrums, see first point.
Always, always, always follow through. If you say “throw that again and I’m taking it” and you don’t take it, you’re setting yourself up for more testing of boundaries. Also, don’t make a threat you don’t mean.
I could probably write a book, if this was helpful I can keep going.