This is the second part of a three-part blog series. You can read the first part here and the third part here.
Most toddlers can say about 20 words by the time they are 18 months old. By age two, they start combining two words to make simple sentences, such as "baby crying." As all parents are painfully aware, by the time they are three or four years old, they become extremely curious and can't stop asking questions. In Russian, they have a special word for kids of that age: Pochemuchka, from the word pochemu, which means why.