Breastfed babies who don’t eat formula can be improved by gradually reducing the amount of breastmilk and increasing the frequency of formula feeding, or by choosing to breastfeed the next meal before trying formula feeding. It is a normal phenomenon for breastfed babies not to eat formula, breastfeeding is usually on-demand feeding within 3 months, and gradually changing to regular feeding after 3 months. If a baby who normally eats formula milk suddenly does not eat formula milk, but if the baby has a good appetite and is in good spirits, it can be temporarily observed and treated. If the baby’s appetite drops significantly, or appears to have poor mental response, it is recommended to go to the pediatric department of the hospital in time. Some older babies, often gradually add complementary foods, these babies in the addition of complementary foods, there will be a period of time to reduce the interest in milk powder, generally transient, as long as the baby’s appetite is good, the spirit is good, generally do not need to worry too much. If there is any abnormality, parents are advised to bring their babies to the hospital in time and follow the doctor’s instructions for targeted treatment.