How many diapers will I need?

Glory

First time mom here! I’m currently 14 weeks but I’ve decided to start putting together my registry. I’m putting diapers on there mainly for my fiancé’s Mom who wants to help us stock up on those kind of things. I am doing sizes newborn-3. My questions are how many of each size would I need and also what is your preferred brand? I currently have the honest company and pampers sensitive. I want to use sensitive skin diapers because my skin is extremely sensitive and I’d rather have sensitive diapers just in case my baby’s skin is anything like mine.