my son is 3 years 5 month old now..he will tell all the name by showing pictures and objects..he started to speak at 2 years 9 month only,now he is using very limited number of vocabulary..but he will convey all whatever he need to tell by expressing single word..he will ask whatever he needs,he loves to mingle with the stranger kids too..is it anything therapy needed r he will pick by his own..but I can see the improvement in his vocabulary words day by day