Explore the possible reasons for a one-year-old child having only two teeth, including genetic factors, gender differences, premature birth conditions, and abnormal pituitary hormone secretion, and provide professional advice.

Explore the possible reasons for delayed mental development in children, including genetic factors, prenatal influences, and family environmental factors.

Premature birth hypoxia is one of the most common causes of pediatric cerebral palsy, with other possible causes including genetic factors, pregnancy factors, birth factors, and neonatal period diseases.