My oldest was probably around 2 (which I think is pretty average).
My son was 12 months. That boy...I swear he wanted to play catch up to his older sister so bad. They are 15 months apart and he was walking at 10 1/2 months and said his first words at 6 1/2 months (4 or 5 new words in 1 week), using 2 word phrases by 10 months and by the time he turned 1 he was using 3 and 4 word sentences. Like, "Go to work, Daddy," as he threw my husband's work clothes at him. That was funny. His doctor was pretty surprised since he said most kids do one or the other early (walk or talk) and usually boys develop speech later then girls.
My middle daughter didn't start using sentences until she was almost 3 (she barely knew 12 words when she turned 2).
My youngest was using sentences at 18 months and carrying on conversations by the time she turned 2. She's 3 1/2 and talks like she is 5. She's a riot to talk to.
at 1:58 PM on Dec. 11, 2009