CD stash amount question

Butterflylove85

I plan on using mostly sposies until the umbilical stump falls off and with my DD being almost 9 pounds at birth i'm hoping this LO will be able to fit in OS pocket diapers right away.(even though I know they will be a little bulky for awhile)

 My question is how many will I need during the day and how many for night time?

I'm trying to diaper two and am having a hard time deciding how many total to get. I want to wash every other day, and If it helps anything I plan on EBFing. I'm planning on having at least 28 for my NB and about 22 for my 15 month old.

Any advice or thoughts would be much appreciated.