From the picture, it appears your daughter has a mild anterior pelvic tilt along with an increased lower back curve (lumbar lordosis), which makes the hips or bum look more prominent. This posture is quite common in young children, especially those who carry heavy school bags or have weak core and abdominal muscles.
Does she ever complain of back or hip pain? If yes, it could be due to postural muscle imbalance.
Next Steps
Physiotherapy management includes: Core and pelvic strengthening (pelvic tilts, bridges, planks) Stretching of hip flexors, lower back, and quadriceps Postural correction and gait retraining Advice on maintaining correct posture and limiting heavy school bag weight.
Health Tips
Encourage her to stay active, maintain upright posture, avoid long sitting hours, and practice her exercises regularly. With proper physiotherapy and posture care, alignment and muscle balance usually improve as children grow.