Further thoughts from me; with my eldest at school now the whole "how does my DD compare?" thing has been much in my mind.
When you have kids, you have to make a decision about how you are going to approach the whole competitiveness thing. Otherwise you will drive yourself insane with anxiety if Jonny can swim better than your DS or Harry is on blue band already when your DS is only on red band. It all gets much worse when they get to school. If we are not careful we project all of our own competitiveness on to the poor old kids.
Much better to think that your DS is an unique person all of his own, who will have particular talents, interests and focusses or I suppose should I say foci. It's our job to respond to them as individuals and nourish their talents and interests and not try to mould them into mini-me's. When they are babies we all imagine they are going to do all the things we did/would like to have done. But as they grow up we realise their difference from us and the fact that we cannot use them as a tool to perpetuate our own existence in the world and be the people we are/would have liked to be.
We also need to think about what our definition of "success" is and what we REALLY want for our children.
Everyone will think differently about this, but there is much more to being "successful" in life than getting into a selective school/going to Oxbridge/having a high status job. I've been a part of that world, it has many things going for it but many of the people in that world, while high achievers in a sense, are nonetheless in the remedial class when it comes to things that really matter - the ability to sustain relationships, the self-knowledge to know what is REALLY important to you, and achieve personal growth as we journey through life (after all, this is what makes for a fulfilled life). I know too many high earners with high status jobs who at 50 are still in the same mindset that they were when they were at Oxford - i.e. what matters is material success and public recognition. No development of insight or wisdom at all, in 30 odd years. And often struggling as a shameful secret with anxiety and depression. It's sad. They only have one life and they haven't really moved on in all that time.
My view is that children who are not pushed too early but who are sensitively supported to follow their own interests will be much more psychologically robust, attain greater wisdom about what matters to them in life, and ultimately be more fulfilled.
So sod the joining the dots writing, let your DS get on with climbing rocks or whatever else it is floats his boat 