NO, IT IS NEVER SAFE TO LEAVE A BABY OR CHILD ALONE IN A CAR, EVEN FOR A SHORT PERIOD. THE TEMPERATURE INSIDE A CAR CAN RISE RAPIDLY, EVEN ON A MILD DAY, LEADING TO HEATSTROKE AND POTENTIALLY FATAL CONSEQUENCES. MOREOVER, A CHILD LEFT ALONE IN A CAR IS AT RISK OF OTHER DANGERS, SUCH AS CAR THEFT OR ACCIDENTAL SELF-HARM. ALWAYS TAKE YOUR CHILD WITH YOU, NO MATTER HOW QUICK YOU THINK THE ERRAND WILL BE.