Hello Doctor, my baby is 4.5 month old now. He did not smile & always see towards forehead. My baby weight around 5.3 kg, birth weight was 2.5 kg. Baby born at 36 week pregnancy & till date he did not rollover & did not keep his neck strong. We consult doctor here, doctor prescribed rapigrow, vit d & multivitamin. He had done all the blood & stool check up & ultra sound of brain & did not found anything abnormal. Could you advise what to check further?