Fantastic advice here.

I’ll only toss a couple of things in too.

If you’re lucky to be taking paternity leave then count the first few weeks as a complete wash of doing “anything”. I recommend nesting in the most convenient room where you can accomplish everything you need to including sleep. If possible, make it not your bedroom. That way you can banish the SO to the bedroom if things are getting overwhelming and a brief break/nap from parenthood can do wonders.

If, god forbid, you have a colicy baby make sure to take sanity breaks. If you have addressed every need and the baby is safe then walk away where you can still hear the crying but can collect yourself. I could never imagine harming a baby until my second and I had to take sanity breaks to stop intrusive thoughts. A sleep deprived brain can only take so much screaming before your animal brain starts screaming itself. If your SO is with a screaming baby all day then any and all time away from them is critical safety need. I used to come home from work and shove my SO out the door.

If you are blessed to have support from friends/family TAKE IT. Don’t abuse it but if someone offers to give you a break then thank them and take it.

If breastfeeding is not possible, do not let holier than thou motherfuckers shame you for feeding your child formula. You would not believe how many times I used to have to snidely reply to people by asking if it would better that my baby die from malnutrition rather than have formula.