My DS is a redhead with ASD, and is very able to remember and apply sun cream.
I have aspergers and I always remembered to use sun cream as a teenager!
Oh well. There's no way any child with ASD could have an issue with it then is there? How wonderful. I'll tell my redheaded DD with ASD that she has clearly been getting sunburnt on purpose when she's forgotten to apply sunblock and she will just start remembering.
When she was 12, we made a point of letting her learn from natural consequences of not organising herself. It didn't work. She wasn't able to function like other 12 year olds and suffered badly as a result. few months later, she fell to pieces, was referred to CAMHS and was diagnosed with ASD. Up until that point, I could easily have been in the OP's shoes and, if I'd described her on MN, anyone suggesting we consider ASD would probably have been shouted down and accused of armchair diagnosing.
I would have appreciated someone suggesting I looked into ASD earlier in her life. I could have saved us all sorts of heartache. For that reason, I will suggest it gently to parents who post on MN, are struggling to understand their child's behaviour and could possibly find it helpful.
Someone always suggests ASD on every thread about every child, ever.
People regularly suggest ASD on threads where parents have explored every avenue they can think of and are still struggling to work out what is happening for their child. That's probably because ASD is more common than most people realise, parents often haven't realised it can present subtly and the posters concerned have recognised something they have seen in their own child with ASD.
There aren't many threads on MN that are about NT children behaving in easily understood NT ways, presumably beacuse their parents aren't often at their wits' end trying to work out how to help them.