Among all the free stuff I got while staying at the hospital was a pampers box. The pampers box came with four nappies(diapers), a pack of wipes for delicate skin, a sample of baby washing detergent, information and coupons for nappies and baby goods at toys-r-us and akachan honpo.
Pampers is the most popular brand used by hospitals for newborn babies in Japan. They are also very popular among consumers even though there are cheaper alternatives available. You can buy pampers nappies in most baby and hardware stores. However, in my experience Nishimatsuya does not carry the brand. You can also buy Pampers nappies in Costco and other foreign retail stores. For the record, I actually have found Cainz to be the cheapest for Pampers nappies.
Like most of the nappies in Japan, Pampers come with a strip to indicate when the baby has urinated. If the strip turns from yellow to blue you know your baby needs a diaper change! I have tried other brands in Japan, but I have found Pampers to be the most absorbant and most comfortable at all ages.
When joining a baby shop’s point system you often get samples of nappies to try out. At my maternity hospital other than the sample we got during our stay I had also received samples at antenatal classes. These are really handy for the nappy bag for a trip out. Although, if your baby is anything like mine, they pee and poop all the time and you’ll need a nappy an hour!