My baby is 3.5 months and she is not turning her head towards sound She does not even respond to my voice when I call her but enjoys and smiles when I talk to her holding her But she startles during loud noises or any other sounds when she is sleeping so that makes me sure that she is hearing well At what age do babies start turning their head towards mother's voice or any other source of sound?? is my baby's development going normal? is it normal for 3.5 months baby to not look towards sound source?