Buying Baby Stuff??

Steph • 23 year old newlywed. PCOS. Baby boy born Sept 2017
Hey ladies! I have a question, when do you think is the right time to start buying baby items? 
I'm taking anything from clothes to the cot! My husband doesn't want me to buy anything yet because he says it's still too early (7 weeks 4 days today), but if I had my way I'd be buying the cot I want at 12 weeks!