I know it varies with every baby,but on average.......just curious because everyone told me not to buy but more than one pack of newborn size diapers,they'll only fit into them a couple of weeks but my son turned a month old and still fits into them.
Newborn diapers are smaller than size 1. My baby started wearing size 1 when she was about 1.5 months old. She's now 4 months old and wears a size 2. So, yes, you will still need to get Newborn size diapers:-)