So, how often should your baby have a bowel movement?
A baby might only wet one or two diapers in the first 3 to 4 days of life. This is until the mother’s milk starts coming in.
After a mother's milk comes in, the baby will start to produce quite a few dirty nappies, and many urine nappies. Newborn babies under 6 weeks
old should be producing quite a few poo nappies daily. If you think your
newborn might be constipated, it's best to go straight to your doctor.
Frequency of stools after six weeks change again, when
breastfed babies produce very few bowel movements (sometimes only one every
eight days). This is because breast milk is digested far more easily than formula.
After six weeks, if your baby is still putting out a few urine nappies
every day, seems happy most of the time, has soft stools when he/she does
have a stool, and is gaining weight, you don’t need to worry about
Breastfeeding and Constipation ~ The Causes and Signs
Causes of infant constipation in the breastfed baby