Advice on clothes sizes!?

Ashley
My daughter was not only born seven years ago but she was also born in January. So I don't remember much about the sizes. I've already bought quite a few outfits but bc I'm due June 5 I'm a little unsure of what to buy. Pants, long sleeves, short sleeves, and what sizes for each one. I know I'll obviously need 0-3 months and 3-6 and all that but anyone that's already had a child, did they mostly stay true to their size? My daughter did but I wasn't sure how much diff it would be w a boy. Helppppp! Hahah.