To determine whether breast milk is malnourished, it is important to observe whether the baby’s weight grows and reaches the standard. If the weight does not grow, it means malnourishment and milk powder should be added appropriately to prevent the baby from getting sick due to long-term malnourishment. If the baby is still sucking fingers after sucking breast milk, which represents the action of hunger, it means that the baby is not full, and the mother can add milk powder appropriately. The color of breast milk does not represent whether breast milk is nutritious or not, so it is not recommended to judge by the color of breast milk, only the baby’s performance can prevail.