Y.K.
hi C., i think every kid is different, boys start talking a bit later then girls. my friend's daughter started talking at 12 months and now 22 months , she speaks clear and easy - knows hundreds of words and repeates everything in different languages, however i've meet many more kids that say only few words at 18months. My daughter is 18 months now and says about 20 words (around 5-7 words in 3 languages) she only learned how to say about 10 words in the past month, it can happen all of the sudden! i was also kind of worried few months ago. also another boy that i know, who is 2 yrs old, says only mama, dada, and 2 other words, but understands everything in 2 languages. so every child is an individual, i think talking a lot and reading really helps them start speaking earlier, but some kids just wait until one day they just start talking fluently, where others say new word every few days or weeks or months. also i just went to doc apptmnt with my daughter and he said by 18months its normal when a child says only 3 words, so by that time he may learn to say few more..... don't worry too much if he understands you well , he'll start talking to you soon, if you see he does not progress in few mns, u can have him checked then.