It is true kids listen from as early as four months...so our ancestors werent telling tales about abimanyu and prahalada the western world is just catching up with scientific evidence of the same....
simple remedy just play a particular song...or music constantly to a preganant womana and the child when born will be at peace if you play that
tthats why it is important for husbands to talk to babys when the wife is preganant
and thats how the child recognises the mother as it knows her voice...