The reason why breast fed babies poop more is due to the composition of the breast milk.
Breast milk is more easily digested than formula as breast milk contains a high proportion of whey protein, which helps to promote rapid movement of food through the baby's digestive tract.
The breast milk also contains lactose, which is a sugar that can also cause frequent bowel movements in some babies and the low fiber in breast milk also can allow for more efficient digestion and frequent bowel movements and pooping in babies.
And babies that are breastfed are also often fed more frequently than babies that are formula fed, which also stimulates the baby's digestive system and results in more frequent bowel movements and more pooping.
Breastfed babies in the early weeks of their life are also developing and growing rapidly, which also requires a lot of energy and also a lot of nutrients.
The increased metabolic activity during the rapid development and rapid growth in the baby also contributes to the more frequent bowel movements.
Some breastfed babies may have several bowel movements or poops a day, and other breastfed babies may only poop once a day or once every few days which is normal.
As long as your baby is gaining weight properly and they appear healthy, the frequent pooping is not usually a cause for concern.
Even factors like underlying medical conditions, maternal diet and use of antibiotics can also influence the amount of bowel movements or pooping that the breastfed baby has.
Breast milk is very highly digestible in babies and the lactose content, lack of fiber and the frequent feeding of the breast milk as well as the rapid growth and rapid development in the breastfed baby all are what contribute to the frequency of poops and bowel movements your baby has.