Background: For infants up to 6 months, ultrasound (US) screening of developmental dysplasia of the hip (DDH) is recommended. This cross-sectional study investigated the developmental data of femoral head size and femoral head ossification in mature infant hips and the impact of mild and severe DDH on femoral head development based on US images.

The physical examination revealed yellowing of the skin and sclera.Liver function tests revealed elevated direct bilirubin (103 μmol/L), alkaline phosphatase (1192 IU/L), and gamma-glutamyltransferase (293 IU/L) levels. The tumour markers (alpha-fetoprotein, carcinoembryonic antigen and neuron-specific enolase) were negative.