Nappies, formula, baby food, wipes and toddler snacks are non-optional buys that add up fast. Supermarkets promote Pampers, Aptamil, Ella’s Kitchen and own-brand lines often, and we check them daily so you can stock up when the price is right. Today’s deals in this aisle are at Tesco, Sainsbury’s, ASDA, Aldi, Morrisons, Waitrose and Ocado.