hello dr,my son is 3 years 7 month old now..he started to speak at 2 years 6 month old..after I put him in the school on his 3 years 4 month old only he started to speak vocabulary (communicative)words..he will tell all names when am showing pics and objects..telling all family members name,responds all my commands ,responds his name wen am calling,now only speaking two words together..not speaking sentence yet,sometimes he is repeating my words when am saying(I felt this he will tell when he don't know the ans what to tell)..else otherwise he is telling colours,vegetables name,animals name,birds name,fruits name,he is asking all his needs.is this normal of asking repetitive words wen am saying also tell after stringing two words together..how many months take to speak in the sentence??