Once a 3-month-old baby is found to be developmentally delayed, the main manifestations are that the head control is relatively backward, the limbs may be too soft or too hard, unresponsive, no weight gain, poor breastfeeding, and the performance of hand clenching and not actively reaching out to grasp objects. Targeted rehabilitation treatment is needed, such as exercise therapy, occupational therapy, Chinese massage, appropriate hyperbaric oxygen, nerve-nourishing drugs such as gangliosides, symptomatic treatment, and hearing screening if the child has hearing impairment.