To my darling little woman of the future,

We have been learning about crossing roads, you and I. We are very particular – even if there isn’t a car in sight we will not go until there is a green man.

Yesterday we were waiting at the pedestrian crossing, your hot little hand in mine, and all was well with the world. “Green man means go!” we said in unison when the light changed. “Mummy?”, you said as we started walking. It was your thoughtful tone. The one that always tells me A Very Important Question is about to follow (like, “What...