I thought of this thread today, though I should probably be adding to the Bad Mothers thread ... Put dd into car, closed doors, turned round to speak to friend for max 5mins, I think actually less. Got into car myself, of course it was very hot and stuffy, it's been a very hot day, and poor dd was bright red in the face with little beads of sweat standing out on her forehead. I feel suitably guilty and offer my experience as a warning to mums to open the windows or put aircon on when leaving tinies in the car for very short periods during this hot weather.