My heart swelled when the lady who stopped to peer into Lottie’s cot in Boots last week exclaimed at what a gorgeous baby she was, just as any mother’s would. When she then said: “She’s a big girl though, isn’t she? Was she big at birth?” My heart sunk. Please don’t make me have this conversation again. “No,” I replied, “She was 7lb 13oz.” “So how…