I know there have been a few posts about developmentally normal behaviours at certain ages, but I seem to remember somebody saying that it is a bad sign if a child stops saying some of the words he/she used to say. I have a 22 month old in my care who has been late to do everything...he walked at 19 months, napped a lot until about that age, and talks very little. He now has probably less than 10 words that I hear him say. He used to say "uh-oh" and "thank you"...but in the past weeks I noticed that he doesn't say them anymore and I have been trying to get him to say them to see if he can...he just looks at me blankly. I know that all kids learn to walk and talk at their own pace, but should I be worried? Should I mention it to the parents? They recently mentioned that they thought he was hitting the terrible twos as he is for the first time putting up a fight to do things he doesn't want to do...but for me the behaviours he is exhibiting are more like a 16-18 month old...in that stage where they suddenly realize they can resist. I am not even sure how I would broach this topic with the parents as I don't think they feel he is delayed (except for the walking). And, I am not a doctor and don't really know if this is just his normal. Advice?