The fast, safe way to warm expressed milk & baby food, the Express Bottle & Baby Food Warmer warms 125 ml/4 oz milk at room temperature in around four minutes. Warm expressed breast milk, formula, milk beverages & baby food easily with the Philips AVENT Express Bottle & Baby Food Warmer. It warms 125 ml/4 oz in around 4 minutes. Note: Philips AVENT recommends that you do not heat baby milk or food in a microwave as uneven heating may cause burns to the throat & some vitamins may be destroyed.