Diaper help - how many?

Rachael • 19 Mumma to a baby girl born June 2020

I’m going to be a ftm and I’ve still got 19 weeks to go but I’m trying to get an idea of how many diapers in each size I might need? I’m wanting to set aside some money for them as I’m on a tight budget and very worried about spending too much on baby wants rather than baby needs! I know it can depend a lot on the size of the baby but just trying to get a rough amount of diapers in each size I may need!