hello dr,my son is 3 years 6 month old..he started to speak in his 2 years 9 month old..he is saying alphabets fully,11 colours,vegetable names,fruits name,animal name,vehicle names,birds name,sounds of animal and birds,months,telling all family members name,singing rhymes,but he is using only single vocabulary words for communicating..I can see improvement in his words day by day..but I worried its not up to his age level..but he can understand whatever am telling nd obeying all my commands..suggest anyone