Had to come in on this one as I have both. Like you Lucylou had DS's 1 & 2 in Sept and Nov because of Christmas,
Having frozen doing the night feeds with DS2
yes possibly did look like that was sooooo cold. Opted for DS3 to be June and DS4 is April.
MollieO is right in that my June son who is in Y1 now is definately less mature in his year group, still gets very tired etc. They are currently encouraging counties to take all children in the September of the year they turn 5 to even this out but that won't make them any more mature and ready to learn unless they are terribly bright.
However what I would say is that standardization which should be fair and even things out is probably penalising some children now because of the tutoring that goes on. I know my younger two will be at an advantage when it comes to their 11+ because with my help and their extra age points it is probable that they will score higher than their brothers.
I also object to the fact that standardization is only used to correct age differentials and not learning issues. For example children that have been taught in a different language for much of their formative years are standardized in the same way as those who weren't. Also what of children who have disibilities?