You know...I think children will develop language when they're ready. There are these "deadlines" for when children should start speaking.... I didn't speak until I was 3.5 years old!!! Seriously...my mom said I did not say a single word .. didn't even babble. She thought something was wrong with me, so when she took me to the psychologist, she was surprised when the psychologist told my mom to stop doing things for me, and I would start speaking to communicate, instead of pointing and grunting.
Enough of my story.... what I'm trying to say is that just because your son (and many other babies) aren't speaking by a certain age, it doesn't mean that you s/he won't develop language. If he can't say "mom" then practice saying other words until he's confident in himself to say them on his own. My 16-month-old can say about 34+ words, but she's always been a talker. One tip I would give you (based on my personal experience, is to not do everything for him. If he wants an apple, but is only pointing to it and grunting, say, "Say apple." If he makes even a little attempt, then give it to him. Not that you should starve your child until he talks (haha), but give him a chance to try before you just give in to everything he wants.
Also-make sure to get him playing with other kids. This really helps with language development. Hope that helps... Good luck!