Saraswati gayatri vaak devi she who controller of speech chant 108 daily you see changes .
Om vaak deviyicha vithmahe
virinchi patnicha dheemahi
thanno vaani prajoyat .
this mantra is recommened by sage agasyta in jeeva nadi for those who have speech difficulties .
Along with that go any saraswati temple or goddess temple lit 5 faces deepa your son will get cured soon . wear emerlad stone chain to your son it activates mercury and gives fluent speech .