Aiyoh most of my friends started around 5-6 bulan, but honestly I started earlier because I was too excited to shop haha! Usually la start with the basics first, cot, mattress, bedsheet, then baju and diapers, because those are the things you really need on day one. After that baru lah boleh santai sikit, buy the "nice-to-have" things like fancy carriers or bath toys when you see sales, no rush pun.