My son is 3.3 years old. I am concerned about his speech development. He talks a lot and knows more than 300 words. He can sing many songs and rhymes, and he knows the alphabet (A–Z), numbers from 1 to 100, colors, animals, and many other things. However, he is still not speaking in full sentences. When I ask him a question, he often repeats the same question instead of answering it. Sometimes he gives a one-word answer, but many times he simply repeats what I say. Because of this, I am worried about his language development. Is this something that may improve with time?