Thank you! He's so pleased it's finally 'his turn' having seen the rest of the class have their birthdays.
No we never really considered deferring him, DH and I had a conversation about it and I looked at the guidance from our local authority but we didn't see a reason to keep him back, especially as he is our second so we had a vague idea what starting school was like!
My due date was 14th September and I was due to be induced at 38 weeks for medical reasons - the consultant asked if I wanted to be booked in for 31st August or 1st September so we'd been through the thought process already in 2018 and I eventually opted for 31st August as wanted him out ASAP to avoid complications I had with DS1. Anecdotally the consultant said her son was an August born and off to Oxbridge and fully supportive of the August date. In the end the decision was out of my hands and he had to arrive even earlier, so I'm quite relieved it wasn't actually my call in the end, but still no regrets with him starting school at 4 + 10 days!
My son is teeny tiny, wearing mainly 2-3 trousers still but there are a couple of other boys and girls in his class who are similarly sized so whilst I'm pretty sure he was the smallest (cutest) one in the school this year it wasn't by a long way. One of his classmates is about the same height as my 7 year old but has a July birthday and his mum said that was really hard as people assumed he was older than he was when he was behaving like a younger child would in public, but starting school has been great for him being amongst children his own age, plus or minus a few months.
We have already had party invitations for 6th birthdays in September though which always jars a bit, but just reminds me how well my son is doing 😊
Unless you have a good, solid reason to defer him rather than just statistics, I'd have faith in him and his teachers and see how he gets on. You can always pull him out if he is really struggling, but once you defer I don't think you can then get him back into the system until next year.