DS started at new nursery 6 weeks ago. He is one of the youngest in his room (2-3 year olds).
When I picked him up today, I was asked to sign an accident form. Apparently there had been an argument over a toy, and DS had been pinched and scratched a couple of times on his arm. This sort of thing, or biting, has happened a couple of times before (also at previous nursery, and with family) so I wasn't too concerned, asked if anything had triggered it (apparently DS isn't always good at sharing - no siblings so hasn't had to practice much), apparently he picked 'the wrong child'.
When we got home and took his T-shirt off, it looked awful. He has several bruises on one arm, with nail gouges all the way up the arm, the skin has been grazed. (this would be through his clothes). There are also nail gouges on the top part of the other arm, and marks on the back of his neck and shoulder, I can't tell how they happened or if they are connected.
Is this just normal for nursery/ playing with other children? Could an adult have intervened earlier?
(The nursery has generally seemed OK so far, DS cries when dropped off in the morning but apparently settles after 5 mins, then seems happy when collected.)