Personally, I think there is nothing wrong with your child, just a lack of correct guidance. It takes a lot of time and energy to raise children. The older generation does not have the concept of early childhood education, which may delay children's language development. Mother's company is the best education. My children speak late, too, because my family has three dialects and Mandarin, but their cognition is very good. I think children's cognitive problems are really the responsibility of you adults. You always say that they have poor cognition and many of them don't know each other. Parents are children's first teachers, and children's initial cognition of the world is guided by parents. If you don't tell him anything, will he know what it is Just like when you first started learning, you didn't know what it was, what it stood for and how to use it until the teacher told you what it was. What can you learn if the teacher throws you a book full of words without telling you anything? My child's cognition has never been deliberately taught. I have been talking to him since I was very young, although he is only a few months old. When I wash his face, I will say, come on, let's wipe our small eyes, nose, mouth and ears. When he said that one part rubbed against another, he naturally knew his five senses. When I go out to play, I will say, baby, do you think this little red flower is beautiful? Can we touch it? Even when I buy toys, I will say, do you like this orange car or this small green plane? Then when my baby is older, I can correctly distinguish colors from objects. When children are young, they are more recipients. How can you expect him to improve yourself without inputting his knowledge?