Sprinkle is definitely the way to go. A small party, but no registry. People will bring gifts, I’m sure, but etiquette says for child number two (and on), you shouldn’t register/ask for gifts.
I would do a sprinkle + a diaper raffle🥰
@manda_5times you can Pinterest ideas .. invite a small group of ladies.. do like memosas and tea .. maybe like tea foods like elegant .. tea sandwich and stuff