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I'm in similar shoes as you..expecting DS2 in April (20 month age gap). I am planning on getting another humidifier, more pacifiers, and more crib sheets. We already got a second crib. I have 1 high chair but am going to wait and see if DS1 will be using a booster by the time DS2 is ready for the high chair. Also waiting to see if we'll need a double stroller.
Diapers and batteries are also on my list.

Same here - I'm having another boy in May and they will be 20 months apart! Technically DS2 doesn't NEED anything, but I feel like he will always get hand me downs, so I'm trying to pick some intentional purchases just for him.

I got a few new NB sleepers (because we never bought any for DS1 and then scrambled to buy like 3 clearance outfits once we got home because he was smaller than anyone expected), and a coming home outfit. DS1 has a few personalized PBK towels/beach wraps that we use all the time, so next time they have a sale I may pick a few up for DS2. I bought one new set of bibs since DS1 is still using his and they are a little bit stained anyway.

Someone gave us a bassinet, so we'll use that for a while and then DS2 will go into a PNP with a mattress in it so I can avoid buying a second crib. I'll probably buy a few more pack n play mattress sheets, since I currently only have one of those. I bought a few extra sets of crib sheets from a PBK clearance because the daycare we're planning on sending DS2 to requires you to send a clean crib sheet every single day.

We're going to wait on a double stroller. We have an UB Cruz and a Mountain Buggy Nano so technically we have 2 if we need them both, but I might ask for the ride-along board for the Cruz for DS2. If we need a legit double stroller, my plan is to sell the Cruz and Nano and buy the UB G-Link.

We're reusing DS1's infant carseat but might buy a second base (we never bought a 2nd one with DS1).

We never had a swing with DS1, but that may be something I could register for - MIL is going to want to buy something big as a gift.

We'll be buying a second humidifier and Marpac Dohm. We'll just use DS1's changing pad for both boys. I might consider a wipes warmer - DS1 is 18 months and still hates cold wipes so maybe I'll finally relent.

I need to buy new nipples for our Dr. Brown's bottles, new bottle brushes, I might buy a few small 4oz bottles, new pacifiers.

I have the Land of Nod hanging canvas storage units in DS1's closet for his clothes, so I may get some for DS2 as well. I also have some personalized decals on DS1's walls from Etsy, so perhaps I'll get one for DS2 also. At some point I guess its only fair to get DS2 is own Anywhere chair.

I have three under four. All the same sex.

All we needed for #3 was another car seat.

When I had #2, we bought another crib, another car seat, and a double stroller.

We were able to get a stroller that had an attachment for the infant seat, and I wish we got the stroller sooner. Since we could use it with her car seat, we would have started using it day 1. My first two are also 19 months apart, so having the stroller was crucial for getting them out and about by myself in the early days.

@gingerbebe: I would keep one single stroller, personally. Mine are almost 2.5 years apart but there have been a number of times I just use a single- if the toddler is walking, if I'm only taking one of them somewhere, if I'm wearing the baby. I have a vista so I just swap out the seats to make it double or single.

Answering even though mine are a bit further apart- the things we needed were the second seat for the stroller, someplace for the baby to sleep in our room (we have a 2 bedroom so baby is with us until I trust them to share a room), and an extra changing pad. Everything else has just been extra nice to haves.