What are the causes of bowed legs in newborns during the embryonic period?

Generally, the main causes of bowed legs in newborns during the embryonic period include fetal intrauterine postural compression, differences in skeletal development rhythm, congenital tibial bowing, congenital hip dysplasia, and vitamin D deficiency rickets. If related abnormalities are detected, it is recommended to seek timely medical evaluation and examination at a regular hospital. Detailed analysis is as follows:

1. Fetal Intrauterine Postural Compression

Fetuses often remain in a flexed posture within the uterus, and continuous compression on both legs may lead to temporary leg bowing after birth. This condition typically does not require special treatment and the legs will gradually straighten as the newborn grows and develops. Parents can assist the newborn with appropriate passive leg exercises under a doctor's guidance.

2. Skeletal Development Rhythm Discrepancy

During the embryonic period, inconsistent rhythm between cartilage development and ossification processes may temporarily alter leg shape. In daily care, ensure adequate milk intake for sufficient nutrition supporting bone development, and encourage regular exposure to natural light to promote calcium absorption.

3. Congenital Tibial Bowing

Congenital deformities caused by abnormal tibial development during the embryonic period can result in visibly bowed legs. Mild curvature can be corrected using orthoses under medical guidance, with regular follow-up adjustments. Severe cases require tibial osteotomy at an appropriate age.

4. Congenital Hip Dysplasia

Abnormal hip joint development during the embryonic period may affect leg alignment and shape, causing bowed legs. During the neonatal period, treatment with a Pavlik harness is recommended; if conservative treatment proves ineffective, surgical interventions such as open reduction of the hip joint may be necessary.

5. Vitamin D Deficiency Rickets

Vitamin D deficiency in the mother during pregnancy can impair fetal calcium and phosphorus metabolism, leading to poor bone development and bowed legs. Under medical guidance, administer vitamin D supplements to the newborn, such as vitamin D2 soft capsules, vitamin D3 drops, or alfacalcidol soft capsules, combined with appropriate outdoor activities.

In daily life, parents should closely monitor changes in the newborn's leg shape and undergo regular pediatric health check-ups. Ensure proper swaddling techniques to avoid excessive leg restriction, maintain balanced nutrition, and follow medical advice for vitamin and mineral supplementation to promote healthy bone development.