Newborn Baby Boy Clothes/Sizing

Hello! May I know how many newborn/3M/6M clothes did you mummies prepare for your newborn baby?? Is it okay to wear bodysuit to sleep at night (without shorts/pants)? Or must it be long pajamas with covered toes? I know that babies outgrow their clothes v fast, but I’m wondering just how much is enough if we don’t do laundry everyday, but once every 2 days? Thank you!!