What you'll hear and what your baby understands her first year.
As infants learn to communicate, they progress at very different rates. Your baby may lag behind at some points, but as long as she produces syllables with consonants (such as "ba" or "da") by 10 months and doesn't suddenly lose the ability to babble once she's gained it, experts say there's no need to worry. Here's a rough schedule:
Signs Your Baby Is Learning to Talk (8-12 months)