I Am Concerned I Saw A Picture Of My Nieces

I am concerned I saw a picture of my nieces two children. They were in the water. When they came out of the water I noticed the little boy who is three had his hand in a cupped position but it seemed like the hand was pronated I am
Not sure if that is the word. He is a happy little boy and his shoulder looked a bit off. Like muscular on one side where the hand was cupped and pronated but the other side of his shoulder looked flat. He is 3 and does not talk as much as a three year old would. Is their a way I can send you a picture and you can look at it. Maybe I am
Seeing things that are not there but I worked with chiropractors an doctors for 15 yrs and his little arm
Looks a little off.