How toddlers understand the world - 2 to 3 years
Between 2 and 3 years, your child will begin to be curious about the world around him and how he fits into it. As he doesn't have the ability to understand anything bigger than his direct experience, he may find it confusing and even a little worrying.
Speech development - 1 to 2 years
Towards the end of her first year, your baby will reward you with her first word. And from that moment on, she will continually amaze you with the rate at which she learns new words.