Change baby's diaper as often as needed to keep baby clean and prevent diaper rashes. It seems like new babies wet their diapers every time you turn around. Your baby will probably need about 90 diapers each week. Bowel movements are less predictable. No specific number of bowel movements is normal or average. Some babies go every other day while others go five times a day. Babies who breastfeed usually have bowel movements more often than bottle fed babies do. Bowel movements are often runny. The color of the stool may be yellow, green or brown. All of these are normal.