During the meconium phase (the first few days after birth), your baby may have four or five tarry, dark, greenish-black stools spread out over two or three days. As your colostrum develops into mature milk, he should have at least two to five bowel movements in a 24-hour period for the first six weeks. He may even have had a bowel movement every time you change his diaper throughout the day.
After six weeks, it's normal for some babies to have fewer bowel movements, though others may continue having frequent ones. Don't be alarmed if your baby has a bowel movement only once a week. He's not constipated unless his stools are hard and dry. If your baby's producing loose, unformed stools with a pea soup consistency and cottage cheese-like curds, he's getting a good balance of foremilk and hindmilk. Don't be concerned if his diaper overflows!
Once your exclusively breastfed baby begins eating solids (between 6 and 8 months of age), his stools will get firmer and have a stronger odor.
Source: https://www.babycenter.com/
