Recently I brought my 3 mth old baby for vaccination and doc review. During the hearing assessment,The doc uses a bell to test if he can hear and turn his head towards the sound , my baby though he responded by smiling back , but he did not turn to the direction of the sound from . In result to this,doc did not pass his hearing assessment and to review in a month time. I try this at home , yes indeed , my LO did not turn towards the sound when I purposely put a bell near both ears. I am quite worried on this . But he did past his hearing test in hospital after he is born.Should this be a concern?