Nappy Size Guide From Pampers | Pampers
In some cases, you might have a choice of two sizes, as the weight ranges can sometimes overlap. For example, if your baby weighs 4 or 5 kilograms a Pampers size 2 nappy might be the ideal size, but if you have a baby who is long and slim you might need to stay with the smaller of the two possible sizes (Pampers size 1) for the best fit.