My youngest is almost 21 months and talks a LOT less than my oldest did so I've been feeling concerned. I'm not sure if it is just because I am comparing or because it is actually concerning... He has probably 35 words but about 1/2 of them are pretty difficult to understand without knowing him well. Like he says "da" for hot "shash" for trash and "sow-sigh" for outside. He doesn't say a lot of words that you'd think he would say like "up" or "eat". And he doesn't put any words together. He seems to understand a lot though. Does he still seem like he is within the normal range? Also, any suggestions for helping him acquire more words/speak more clearly?