August born DS currently in reception.
We thought about deferring entry, but in the end didn't.
Partially I do regret not deferring.
DS is academically able and would have probably learned at least as much 'academic' stuff at home with me/at his great Montessori nursery as he is learning at school. Academically, it would have been no problem for him to start later. If not an advantage. But academically he is ok at school too.
Socially it has been very hard. It has been taking everything out of him. E.g. he strongly dislikes school because he is slow at lunch and ends up having the bigger kids (next shift) sitting with him after all his mates have left. He very much wishes he could stay at home. I am quite distressed that at 4.6 he already dislikes school.
Emotionally it has been brutal. He was very confident and mature for his age in many ways before starting school, but now he has to fight for attention all the time, being one of thirty. I feel he is just to young for that. And it has had effects: He has stopped wanting to tell everyone about everything; he doesn't say hardly anything anymore. It feels as if he has stopped believing that he is worth anyone's attention. And has developed totally untypical behaviours which to me are clear signs that he is struggling with lack of attention.
The time outside of school is, sadly, very very short (get home-read-half hour playing alone while I make supper-suppertime-bedtime) and with a new sibling at home as well, it is not really possible to make up for all that by giving him more attention at home.
Yes it would have been hard for him to start school later, as well. But he might have been more 'ready' for it. I don't think making someone start something earlier will help them if they are simply not developmentally ready for it. He would have had similar struggles if he had only started in April but he would have been 8 months older and all that more mature and perhaps more able to deal with these things. Rather than struggling through two miserable terms of reception which hasn't done anything except teach him to dislike school. It most certainly hasn't taught him how to deal with no longer being the centre of attention. Apart from making him unhappy. It hasn't taught him how to eat faster. But he has learned to hate lunchtime. Etc.