During the first few days of life the baby passes meconium, which is a black or dark green sticky stool of “marmite” consistency. After a few days, stools change. Breastfeeding stools are normally mustard yellow with white “seeds” of curdled milk. Breastfed babies have a wide variety of stooling habits. In the first few weeks they tend to pass stool after most feeds. After a few weeks they settle into a pattern which is widely variable: from 7-8 stools per day to one stool per week- this is all within normal limits.
Babies on predominantly formula feeds should ideally pass stool at least once a day. Babies often groan and strain and become red in the face when they are passing stools- this is normal unless accompanied by painful crying. If you are concerned about constipation- (if stools are infrequent or unusually hard or painful to pass) please consult your doctor.