3 yrs old baby but not speak and don't give any response when call him by his name what we do

A. There could be a delay in the growth of your child whether the mentally or child is unable to figure out that you are calling the child and it’s not a good sign it can also be associated with mild to moderate autism I would advise you to consult us child psychologist and if they confirm any of these things and go for homeopathic treatment along with the therapy suggested by the doctor