It is important to determine whether the lymph nodes in the back of the baby’s head are physiological or caused by a disease. Lymph nodes are a part of the lymphatic system and are distributed throughout the body. The lymphatic system is not yet mature when the baby is born, but it will develop vigorously during infancy and early childhood, so you may feel a single, painless, soft lymph node of green bean to soybean size at the back of the head, which is a physiological phenomenon and usually does not need to be treated, and will disappear slowly during the natural growth and development of the baby. If it is caused by disease, the baby will feel pain when touching the lymph nodes, and then resist or even cry, so you need to go to the hospital in time to find out the cause and then actively treat the symptoms. Lymph nodes in the back of the baby’s head, generally do not need to be overly nervous, daily attention can be observed, such as physiological phenomena, can slowly disappear on their own, while if there is a significant increase or discomfort, it is recommended to seek medical attention.