Our son was diagnosed with autism when he was 5. For me, it was mainly reading child development books, and just seeing the difference between his strongest skills, and his weakest skills. For my son, he doesn't have the sensory issues that your child has. It's more that his verbal communication is quite low, and he has some rigid thinking. He also has a lot of anxiety. If you're concerned, you should get an evaluation done. We did ours through a developmental pediatrician through our medical provider.
