Generally speaking, breast-fed babies will have more bowel movements than formula-fed babies. While there might only be one dirty diaper a day for the first several days, by the time they are five or six days old, there are likely to be as many as five dirty diapers to change with every day. Don’t be alarmed if a day or two is skipped, but if they have no bowel movements for several days in a row, you should contact your pediatrician.