Baby clothes sizes?

Shiara • Im an 18 year old FTM, engaged to the love of my life, the beautiful man who gave me my perfect little son 😍 15/18/16💙
How many outfits do i need of each size?! We have a few newborn and a lot of 0-3, some 3-6 and TONS of 6+.. The showers sunday but i want to make sure we have enough, and dont have WAAAAY too much at the same time..