My son is 2 years and 5 months old but not started to talk fluently... says appa Amma,akka n some more words...he follows what we saying but not trying to say it....what can we do further either to consult a doctor or not..?

while a lot of kids start speaking fluently by this age, there are again a similar number of kids who don't. different kids reach various developmental milestones at different times in their formative years. i think you should try to keep talking to your son and encourage him to speak more. if it does not improve in the next few months, by the time he is already in kindergarten, you should consult a PD and a speech therapist.