NEVER place the probiotic dropper directly in the mouth.  The dropper is made from high quality strengthened glass but is not unbreakable.  Administer the probiotic by dispensing the labeled amount (5 drops / 0.33mL / fill once to line marked on dropper) into ready to consume food and beverage, from a spoon or place directly onto the breast prior to feeding.  Do not place in HOT food and beverage.  Do not microwave after adding.  Hot food and beverages can damage live probiotic cells (above 77oF).