I've always hated a dismissive attitude of children not remembering things so it doesn't matter/ don't bother (frequently found on holiday threads where it is apparently pointless taking a child under at least 5 on holiday. DS however loves reminiscing on the off-road jeep ride we did when he was 3, so it clearly left a mark. I remember the bunkbeds and hotel room I was sick in at 3
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Children tend to play alongside each other rather than actively with each other until around 3-4. DS1 has high functioning autism and was still developing at it at 5 at school. Nurseries and the first couple of years at school will need to adjust on social skills in the next year or two because some children will have a little delay as they adjust and get back to normal interractions.
There is always a child or two with seperation anxiety and there is likely to be a few more for a while.
1:1 family time had its own benefits which are different to those of socialising with peers.
It is a valid concern, but for most children affected (and many will just adapt easily) there might be a few weeks/ months of adjustment to get back to where that child would have been under normal circumstances.
I've been talking to DS's teacher about his personal targets and my greatest concern out of this is his social skills. Fortunately his has a sibling close in age and interests which goes a long way, but I am concerned about his anxiety at adapting back to a normal busyness of social life in school. He's quite happy with a quiet life at home, but that's not the way the world will rock on long term. Incidentally, due to tough pregnancy/ birth, we didn't get out much when he was 2. Obviously he always would have had social delays with the ASD anyway, but even with that less than ideal phase (and a new sibling did rock his world), he still developed passable social skills, just more slowly than NT children.