Hi OP,
I deferred my summer born as he was late August born so instead of going to school just after his fourth birthday he started a few days after his fifth birthday.
Academically he’s been fine, and for the last few years he’s gone to the year above (where he “should” have been) for his maths lessons, but from a social and emotional point of view, he’s far more in keeping with his main class.
He’s about to start Year 3 (so “should” be starting year 4) but we’ve never regretted deferring his start.
His last two teachers tried to get us to make our son skip a year so he could go back into the year group he “should” have been in, but we never even considered it. Academically I’m sure he would cope but that’s just one aspect of the schooling experience and I think being moved up a school year would be detrimental to him in other ways.
He’s obviously the oldest in his year, (unless there are any other deferred summer borns in his year group which is of course a possibility) but only by about a week, and then within the following 6 weeks there are many other children turning the same age as him, so it isn’t like there’s a particularly big age gap between him and some of the other children.
The only way that it’s most obvious (to me) that he’s a deferred summer born is when he is with the summer borns in his class who started just after turning 4 years old (so a whole year younger than my son), as my son is obviously physically bigger than them in size, and he’s probably taller than about 75% of the class. He’s not one of the tallest or one of the “biggest built” children though despite being the oldest.
Based on his size alone I imagine a lot of the parents think my son is one of the oldest in the class but assume he’s a September/October born as opposed to August born.