C.C.
Nah, don't worry. Babies tend to fixate on one sound at a time at that age. My oldest made only vowel sounds at that age, and then one day at 9 months, she looked at the cat, and clear as day yelled, "CAT!" - and then squealed in delight as the cat ran away. (And she has never shut up once in the 8 years since! LOL) But at 9 months, that was the first time she ever really made any consonant sounds that I recall.