Infants with concave sides of the head may be caused by genetic factors and diseases. 1. Genetic factors: some babies’ parents have unevenness on both sides of the head, which may lead to concave on both sides of the baby’s head under the influence of genetic factors. 2. Disease factors: Microcephaly, cerebral hypoplasia, craniosynostosis and other diseases may lead to the concave sides of the baby’s head, and may also be accompanied by abnormal intellectual development, vision loss and other manifestations. The two sides of the baby’s head is concave, may also be for other reasons, ruled out physiological factors, it is recommended to consult a doctor as soon as possible, after the cause is clear, give targeted treatment.