DD says mama, dada, hi, bye, and daw (dog) thats it! I think their vocabulary/speech really picks up between 15-18 months. I wouldnt worry just yet.
TTC#1 for 19 months with PCOS and MFI IUI#3 + injectables = BFP!!!! Beta#1-134(13dpiui) Beta #2-392(15dpiui) #1 born December 2011
TTC#2 - Beta #1 -51@10dpo Beta#2 -1353 @16dpo #2 born May 2013
TTC # 3 June 2014 BFP 12-1-14
#3 born August 2015 #4!!!!!!! due June 2017
C only says mama and no, and she calls DH "bob." She understands a lot more than she can say, though, as I'm sure yours can. I wouldn't worry about it!
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Alex doesn't say much yet either, but he understands a lot. My pedi actually said that he should be able to say 10-15 words by 15 months, but he is the only one I've heard that from so far! I am not concerned, I am pretty sure he'll be okay and start talking more soon :-)
C babbles mama and dada, but I'm not convinced he knows what they mean. I would say "up" is his only word and he rarely uses it. He prefers to run around with his arms up in the air instead. I'm not worried about it, I'm sure he'll start talking eventually.
Re: Not talking much?
TTC#1 for 19 months with PCOS and MFI IUI#3 + injectables = BFP!!!! Beta#1-134(13dpiui) Beta #2-392(15dpiui)
#1 born December 2011
TTC#2 - Beta #1 -51@10dpo Beta#2 -1353 @16dpo
#2 born May 2013
TTC # 3 June 2014 BFP 12-1-14
#3 born August 2015
#4!!!!!!! due June 2017
Pretty much this, only substitute "eat" for "up".