spoiled 2 year old and a newborn😅

I have a spoiled two year old and my fiance and I got my IUD out Thursday and I'm just concerned on how my 2 year old will react to having to give up some of his attention, and I'm worried he will get jealous of me breastfeeding our newborn? any advice? He likes to scream at the top of his lungs when he doesn't get what he wants.😔