The other day, I took Alistair out for a walk in his jogging stroller. Usually, the instant his five point harness snaps shut, his eyes close with equal ferocity and he’s out for the duration of the stroll. But this time, his baby blues were open wide in amazement. Birds, trees, cars and tall buildings – these are pretty spectacular sights for someone who has previously only been able to see as far as his feet.