When a mother goes to buy diapers, she has a very critical question on her mind. Buying more might save you money in the long run, but if you’re a first-time parent, you may have a few questions. The foremost question is How many diapers does a baby go through in a day? And How many baby diapers should I buy at once?is the second question. But, pinpointing specific solutions is difficult. On average, babies require eight to twelve diapers per day. But every baby is different, you’ll have to figure out how much your newborn will need to be changed as you go. As newborns become older, their diaper needs change. During the infant stage, your child will require the most diapers. By the time they go to training, they’ll have learned a lot. When they reach training age, they may only require four or five diapers per day. Diaper sizes are determined by weight rather than age. Because every baby develops at a different rate, predicting which sizes they’ll need at 3 months, 18 months, and beyond is practically impossible.