Your pediatrician doesn't seem too concerned, so I wouldn't be. They develop at their own pace and speed, and it is not uncommon for them to have some skills they achieve on time or ahead of schedule, and have a couple that they don't. I think a lot depends on their general temperant, and I also know that it is not uncommon for them to kind of "pick" things they are interested in so to speak, and just focua on that task until they merit it. Also, it is not uncommon for boys to take a little longer to speak as well. Now, I expereinced the opposite with my two. My oldest, a boy, started saying words for things and pointing at eight months...maybe he couldn't say them correctly at first, but he would watch your mouth form the words, and try and try until he could. He was like that with walking, eating, everything...that's pretty much his personality in general (except when we brought #2 home, then he got lazy lol.) he's like that in school as well (has a hard time with fine motor skills because he's a lefty), but he persists. Now my other one, a girl...I can't tell if she's observant, or lazy LOL. She turned two in August...she hardly spoke a word until then, a few mama's, dada's, uhoh's, etc. (probably around 15 or 16 months). I was really becoming concerned, afterall they always say how girls talk earlier, etc. she would just cry and point to things or go get things. Well, in the last three months the vocabulary has just exploded :) Shortly after she turned two it went from hardly a word, to full on sentences, and I mean five and sic word sentences, and she speaks pretty clearly too!! But that's just her tempermant...she wines and cries, or says nothing when she can't figure out how to do something, then one day she figures it out, and does it like she's been doing it forever. She really didn't crawl, just kind of sat and scooched to things she wanted, she did this until she was a year old. She did a little bit of the pulling up thing, but mostly scooching, until she was 14 1/2 months old...then one day she got up and walked like she had been practicing for months in secret LOL. My point is I guess, is they all have their own ways, and styles of learning things. It's such a big new world to them, and so many things to explore...your son may just be too "busy" (and I know 1st time walkers are extremely busy)to want to talk right now. It will come in due time :) Hope this helps give you some perspective.