Sounds perfectly fine to me hun
DS only really says "mumma/mum" & "gollygollygollygolly" while his dummies in his mouth LOL He also does alot of babbling. He hasn't even really said "dada" yet (although ask XH & he swears he heard it once LOL)
I cant really remember DD's speach at this age (although I do have her first 5 yrs book, I might have a look out of curiosity!) I think she really took off with words somewhere around 12-18 months??
I'm not worried about DS's few words & you shouldn't be about Jazz's... it sounds like she's doing great with everything else!!!