Exclusively breastfed babies have soft, golden yellow stools, while formula-fed babies have light brown, lumpy stools. With the addition of complementary foods, babies’ stools gradually take shape, and optimally, they have soft, banana-shaped stools. Exclusively breastfed babies have soft, golden-colored stools because breast milk is rich in whey protein, prebiotics, and lactose. For formula-fed babies, due to the high casein content in the formula and the relatively high calcium, phosphorus and other minerals in breastmilk, the child’s stools are slightly hard, light brown and lumpy, and some babies may have streaky stools. After joining the complementary food, due to the reason of the complementary food, food residue gradually increased, fiber, pectin, etc. so that the volume of the stool capacity to increase, and gradually shaped, the best state is a banana-shaped soft stool. If the baby’s stool is too thin, watery paste, consider the baby there is diarrhea; if too hard, the appearance of the stool is split or even in the shape of sheep’s poop egg, consider constipation, and so on. The stools of babies are an important factor in determining the functioning of the baby’s digestive tract. If there is any abnormality, please seek medical advice from your pediatrician.