Most of the delayed gross motor development is caused by neurological delay in the brain, which can be manifested by unstable vertical head at 5 months of age and inability to sit alone at 9 months of age. Most of the children have high-risk factors before, during or after birth, such as prematurity, low birth weight, hypoxic-ischemic encephalopathy, hypoglycemia, multiple births, and in vitro fertilization. If you have the above medical history and manifestations, take your baby to the hospital in time to give the necessary early intervention and rehabilitation treatment. The younger the age of rehabilitation treatment, the better the rehabilitation effect, most of which include gross motor training, massage, acupuncture and medicinal baths.