C.R.
Hi J.,
I wouldn't worry too much. It's hard having two, you want to compare them sometimes. :)
My first son didn't want to walk until 17 months old and really didn't crawl until a few months before. He did some kind of army crawl before that. As for speech I think it's the same thing, before you know it you will be chasing him around in circles and have a hard time getting a word in edge wise! Hang in there and give it some time. But if you are really worried about his speech, you may want to discuss it with his doctor.
C. :)