My concern is that he shows no interest in sitting down and concentrating on the types of activities I keep reading that other
toddlers enjoy, and I wonder whether he is already showing signs of some kind of ADHD or attention-related problems. He will not do puzzles, play with blocks, spend much time with shape sorters, or draw or paint, or anything similar. He does like to look at books, and play with cars / planes / trains, but usually not for very long.