Do not use in microwave oven to warm formula. Serious burns may result. Failure to follow these instructions could result in severe harm. Opened bottles can spoil quickly. Either feed immediately or replace cap and store in refrigerator at 35-40°F (2-4°C) for no longer than 48 hours. Do not use opened bottle if it is unrefrigerated for more than a total of 2 hours. Do not freeze. After feeding begins, use formula within one hour or discard.