Sorry to possibly be seeming to throw a spanner in the works here- but personally I think it's a huge shame our UK 'one size fits all' school entry system. I agree with everyone who says, basically, that come what may, the DS HAS to start in the 'correct' school year so as not to be hugely disadvantaged ie in being shoved straight into Year 1, missing the potential social development of his peers in reception but the statistics back up the reality that older kids do better. 70-odd% of Oxbridge entrants are Sept-Dec babies, apparently! I'm not for a moment implying that academic success is the one true measure- obviously it isn't, but it DOES demonstrate that a child with the potential to do well academically is far more likely to do so if older! My DSs are May-born and they've both struggled, academically and socially. Even in year 3, the 'young' factor is STILL in evidence, according to the teachers, especially amongst the boys! However, every child is different and whilst the statistics demonstrate a 'trend' they can't speak for individual children, so all is not lost! I just wish ALL kids here in the UK could go to school when they're ready, not when they have to.