My baby is 6 months old but when i call him by name he does not respond he seems to be busy in his own Should i worry about it

A. At this age of child may not be aware about the fact that you are calling that because at this age kids do not have a permanent name a lot of parents called her kids with thousands of different name is Sudhir not sure so bye the age of 8 to 9 months you can be more sure about it and also you should call your child with Ib right now this is completely normal