preparing for baby?

Marie • Pregnant with baby #1🤰💙👣

All moms out there when did you start buying things you needed for your baby? like a crib , clothes , diapers , bottles and etc ? Im a first time mom and I’m 20 weeks today , will be finding out the gender in a few days ☺️💕 and I was wondering when would be a good time to prepare for the baby , my sister in law didn’t buy till she’s 33 weeks and till now she only brought formula and diapers that’s it not even a crib yet .