18 Weeks Pregnant - Diappers and Newborn clothes

Hi all, I’m first time mom to be, I am 18 weeks pregnant. I haven’t prepared much yet, but for the diapers, what are the sizes that I need to buy and get ready? Every time I go to the store and look at them and I get confused. So I assumed to buy more than one size… I mean is it that what you ladies did too? Also, are diaper sizes differ from one brand to another, in terms of comfort? I am planning to buy Costco brand since Costco is just across the street from my house and easy access for me, also less expensive, but I am not sure how good it is anyways?

Another questions , how many of Newborns clothes do you think I need to get of each, I know they grow out of them fast. Any brand recommendations too?

Question #3 Bottles

How to know which bottles i should get? I saw several brands out there but I can’t tell the difference between them and don’t know which ones are the best ones to get for my child. I want to get Glass bottles instead of plastic bottles. Any suggestions?

Thanks 💕