There is usually no fastest solution for a 4 month old baby’s breastfeeding aversion, you need to adopt the appropriate solution according to the actual situation of the baby, such as changing the breastfeeding tools and the environment, and if necessary, you need to go to a regular hospital, follow the doctor’s instructions to adjust. A 4-month-old baby’s anorexia may be caused by a dislike of breastfeeding tools and the environment, which requires changing the tools and the environment for the baby. Sometimes babies may not be able to adapt to the milk formula they are fed, in which case they need to change to a suitable formula. The 4-month-old baby anorexia may also be caused by physical discomfort, such as fever or gastrointestinal dysfunction, etc., this situation needs to be timely to the regular hospital, a clear diagnosis, and then targeted treatment. If the baby has a fever, you need to follow the doctor’s instructions to lower the temperature, such as physical cooling or the use of acetaminophen and ibuprofen and other drugs to lower the temperature, if the gastrointestinal dysfunction, you can give the baby to take probiotics to regulate. It is recommended to pay attention to keep the baby warm and avoid the body from getting cold. The tools used to feed the baby should also be sterilized regularly, and the baby should also be allowed to have sufficient rest. If the baby is not feeling well, parents should not use medication without authorization, and must strictly follow the doctor’s instructions.