guide to diaper buying lol?

First time mom here, I know you're never really prepared but I am 17 weeks and I would like to start buying diapers now but the question is how many of each size do you buy lol because I know babies grow super fast, should I just put the money to the side and wait or should I start buying the diapers and wipes how I originally planned ? All suggestions are welcomed ! Thank you guys in advance 

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