When to start buying stuff for the baby?

rebecca • 💖Married April 26th in Montego Bay, Jamaica💖💏👰🤵Pregnant with #1, due date March 15,2018🤰👶❤
Excited and anxious, I was wondering when did all yall start buying stuff for ya baby?? Husband is excited and I'm excited, due March 2018. I just dont know when to start buying things and when to put up registries.