Baby Language Quiz!

We realized that we haven't had a quiz in a long time, so here we go. Our topic is children's language development.

Typically, how old are babies/toddlers when they:
1. Consistently respond to their own names?
2. Start to use a few words consistently with meaning (not just understanding but saying the words themselves with obvious meaning)?
3. Use cooing and other noises specifically to attract your attention?
4. Start to combine words into short noun-verb sentences?
5. First recognize friendly or angry tones in others' voices.

We'll post the answers on Friday!