my baby s 2 and half month old boy.. he is still not turn to my voice when I sit next to him n cal his name.. do I need to worry

Please observe his eyes and see if you see a reaction. At times since the head is heavy and there is no head control the baby may not be able to turn his head. Also does the baby react to other sounds. Watch for reactions in the eyes. You can discuss your concerns with the doctor to help feel calmer.