My baby is 1 year and 9 months old. He learned to walk a long time ago, but he always stumbles and falls, and his reactions are slow. Sometimes when I try to逗him with his favorite toys, it's like he doesn't see them, and he ignores me. I feel like there might be something wrong. Last month, I took him to the hospital, and the doctor said that my child has sensory integration dysfunction. It was the first time I had heard of sensory integration dysfunction. The doctor explained that it means the brain's command over different functional areas and parts of the body is disordered, and the information flow isn't smooth. As a result, the commands aren't as effective, and coordination isn't as good.