I'm not quite up to making this decision yet but I have already thought that I will be keeping my March DS back. For similar reasons that 3littlemonkeys and Kim have said re:the later school years. My mum has also done work in the lower primary classes and has seen first hand the affects on a classroom where children (more so boys) have been sent to school because they are the right age not necessarily because they were actually ready. I think especially boys need that extra bit of maturity. That is not to say that a younger boys are not smart or won't cope, some will, I just think that once they get to school with other boys they can be more easily 'dragged down' into less than desirable behaviour than if they have that extra maturity. Good luck making your decision, please be happy with whatever you decide to do (my mum still beats herself up about some aspects of our schooling and I think while she may have been able to make some different/better decisions that we got through anyway and it makes us who we are). Hope this makes sense. xo