As someone who has worked extensively with children with Autism, all of what you have described could still fit in to "normal." Really she would need to take him to a paediatrician for a full assessment.
A lot of children hand flap in excitement. The grinding could be teething. Many children just reach milestones later, and lets hope that this is the case with your nephew. The fact that you are concerns would lead me to believe that there could be a problem, therefore it should be investigated further. The earlier the intervention, the better the outcome for the child.


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