My baby born premature on 33 week after born still on hospital and had many complication bilateral pneumothorax and still on ventilation for 2 weeks then bronchopulmonary dysplesia but nowok he born on 7/may2013 now on corrected age he have 7 monthe now he sit with supprt he lift his head turn from one sit to other site follow object &sound turn thebody to both side he transfer object between his hand catch the object with both hand good movement &have 2teeth but may question he did not sit untill now alone without support it mean aproblem