Under normal circumstances, the NB number of diapers can be used from the birth of the baby to about 1 month after delivery, but the specific use of time is mainly related to the actual situation of the baby and the brand of diapers, should be a specific analysis of specific problems, not a generalization. NB number of diapers can be used from the birth of the child until the weight of about 5 kg, usually the child grows to 5 kg takes about 1 month of time. If the child is born with a large weight and belongs to a huge child, then the use time of NB number diapers should be shortened, while the use time of premature babies can be relatively extended. In addition, due to the differences in the design of waist and leg circumference of different brands of diapers, the specific use time varies from person to person. Therefore, parents are advised to buy diapers that are suitable for the baby’s hip circumference according to the baby’s birth and later weight growth. At the same time, care should be taken to choose soft, breathable diapers.