Thanks, Emma, I appreciate your response.
According to my mom, I was a late talker too--I never babbled much, just started speaking in sentences at around 2. But I also had a very chatty older sister! I'm wondering if Mallory will follow my pattern. We have her 15-month checkup on Friday (a month late!) so I'll see what the pediatrician has to say. I'm inclined to give her a few more months and see what develops.
I have become more aware of the way I talk to Mallory; for example, if she points at her cup, instead of handing it to her and saying, "Here you go," I'll make a point of saying, "Here is your cup," and so forth, just to emphasize the names of things.
One funny thing, though. She used to play the "roll call" game at meals...she'd point at everyone in the room and wait for someone to name the person she was pointing to (Mommy, Daddy, Grampa, etc). One day she was pointing at me and I said, "YOU say it," and she said, "Mama!" I got very excited and said, "Yes, that's right!" And ever since then her enthusiasm for the roll call game has diminished considerably. Maybe she outgrew it, maybe she doesn't like having to do the work herself!