@Lazydaisydaydream just catching to! I totally hear you!
We are having twins and at the last scan they showed as breech but wanted to secure a date for a C section delivery just in case. Our consultant suggested 37 weeks which would be the 30th Aug, I pushed back and asked for 37+3 which would be 2nd Sep! Of course they can come before that but both my husband and I work in education, and while we would save a fortune in nursery fees, I'd prefer them to be the eldest in the year.
Another way of looking at it, if your baby was born on the 1st Sep and given the choice, I doubt many parents would opt to send their kid to school a year early. 🤷🏽♀️
BUT my husband who is SLT at a primary school has said, as long as children get support at home, it evens out and by the end of reception summer babies have caught up.