Baby clothes advice

Yulia
I'm FTM and trying to figure out how much of everything I need. 
I have a lot of onesies without feet and couple of footed onesies. I also have swaddles and sleep sacks for sleep. 
I'm having the baby in mid April in NYC so it will be chilly for maybe a month and a half. 
How many onesies with feet should I have?Thank you!