The way you have to dress the circumcision (assuming you get that done) made diaper changing a little difficult for the first week or so. All that petroleum jelly and having to point the pecker upwards made my son piss through the top of all his diapers and soak all the clothes/swaddles he slept in early on. to that point, go ahead and buy several squeeze tubes of petroleum jelly ahead of time if he’s getting circumcised.
Get lots of zip up swaddles, especially for at night - way way easier to deal with. we have one in particular they allows him to have his arms raised up by the side of his head that is his favorite, he hates keeping arms down by his side. Also, we had several gowns and they made diaper changing super easy as you just have to pull them up and not worry about taking them all the way off.
we did the uppababy Mesa car seat/base - you can put a base in each car and just click the car seat in and out. The car seat also clicks into our stroller which is pretty clutch.
get a shitload of newborn/1 diapers, you’ll fly through them.
hatch noisemaker is great, you can adjust sounds/sound level and light color/brightness from your phone.