Babies who are exclusively formula-fed have significantly less frequent and thicker stools than those who are breastfed. The color of the stool of formula-fed babies is usually dark yellow or earthy yellow, and the color of the stool may change depending on the type of formula. Formula-fed babies’ stools smell a little more foul than those of breast-fed babies, and formula-fed babies’ stools are shaped, striped, and dry. The color, shape and smell of your baby’s stool will reflect whether your baby’s digestive function is normal or not. During the feeding process, you should always observe your baby’s stool, and take your baby to the hospital if there are obvious abnormalities.