What causes short legs in infants, and what should be done?

In general, short legs in infants may be caused by factors such as genetics, unstable growth and development, congenital hip dysplasia, growth hormone deficiency, or vitamin D-deficiency rickets. If parents have concerns, it is advisable to seek medical consultation early. The specific analysis is as follows:

1. Genetics

Genetic factors are passed through genes and influence individual growth, development, and body characteristics. Leg length, as part of body proportions, is also regulated by genetic inheritance. Overall body shape and health can be improved through proper nutrition, exercise, and healthy lifestyle habits.

2. Unstable Growth and Development

During infancy, growth and development follow a pattern where the head develops first, while limb development lags relatively. In this case, short legs may represent a normal physiological phenomenon that does not require special treatment. Ensuring adequate nutrition and sufficient rest will support healthy infant development.

3. Congenital Hip Dysplasia

Abnormal shape of the infant's acetabulum or femoral head can restrict leg weight-bearing and growth, thereby affecting normal leg development. Early detection and treatment are crucial. Doctors typically recommend orthotic devices such as Pavlik harnesses or Denis-Browne splints to help restore the hip joint to its normal position and promote proper development.

4. Growth Hormone Deficiency

Growth hormone deficiency is a developmental disorder caused by insufficient secretion of growth hormone from the anterior pituitary gland. This condition affects the growth and development of various body systems, leading to slow height gain and relatively short legs in infants. It may also present with characteristic features such as short stature and a youthful facial appearance. Doctors generally recommend growth hormone replacement therapy, involving injections of recombinant human growth hormone to compensate for the deficiency and stimulate bone growth and development.

5. Vitamin D-Deficiency Rickets

Vitamin D deficiency disrupts calcium and phosphorus metabolism, resulting in abnormal skeletal development. This may manifest as short or bowed legs in infants, along with symptoms such as bone pain, muscle weakness, and poor tooth development. Adequate vitamin D and calcium can be obtained through sun exposure and consuming foods such as animal liver, egg yolks, and fish, which help restore normal calcium-phosphorus metabolism and promote healthy bone development.

During an infant’s growth and development period, parents should ensure the child receives a balanced diet and encourage activities such as standing and walking to support healthy growth.