Gross motor development refers to the progressive achievement of large muscle movements that enable an infant to control posture, balance, and movement. These milestones occur in a predictable sequence, although the exact age of attainment may vary slightly among children. Knowledge of these milestones is essential for planning child care services, monitoring normal development, and identifying developmental delays. Birth to 1 Month A newborn exhibits primitive reflexes and has very limited voluntary motor control. The infant usually lies in a flexed posture with arms and legs bent. When placed on the tummy, the head turns to one side and may be lifted momentarily. Head control is absent, and the head lags completely when pulled to a sitting position. 2 Months The infant begins to gain better control of neck muscles. While lying on the stomach, the baby can lift the head to about 45 degrees and hold it briefly. Movements become smoother and less jerky. The infant kicks both legs actively and begins to move arms more freely. 3 Months Head control improves significantly. The infant can lift the head and upper chest while lying prone, using the forearms for support. The head remains steadier when held in a sitting position, though some head lag may still be present. The baby also begins to kick vigorously and move symmetrically. 4 Months The infant achieves good head control