What happens if formula freezes

Related: 13 of the best baby formulas. An unused bottle of formula mixed from powder can last up to 24 hours in the fridge. Related: How long can breast milk sit out? Milk-based products are notorious for growing bacteria. Again, bacteria is the issue here — and bacteria thrive even more once given a nice warm environment to grow in.

A heated bottle should be used within 1 hour, and any remaining should be poured down the sink after that time. This applies to formulas prepared from powder as well as concentrates and ready-to-drink options.

Generally, you should use up powdered formula within a month of opening the container. Related: 10 organic formula options worth trying and where to buy them.

Like powdered formula, though, concentrated liquid formula cannot be frozen. When thawed, it tends to separate, leaving an oily layer on top that will not mix back into the rest of the formula or mix with water.

Formula that is ready to feed or formula that has been prepared at home should not be frozen, either. Like the other types of formulas, the composition of ready-to-feed formula will change when frozen and may result in separation when thawed. Unlike formula, you can freeze breast milk. If you do freeze breast milk, purchase appropriate containers or bags.

Leave a small space at the top of the container because the milk will expand as it freezes. Freeze breast milk in small 2-oz. Small amounts will thaw more quickly and help you avoid wasting too much. If you choose to make your own baby food, make large batches and freeze it in small convenient portions. Often, you will find that you will have to add liquid to the foods that you puree to make them thin enough for your baby to eat.

If you choose to use formula to thin your baby's food, do not add the formula before you freeze it. Loulouka Cow Milk. Loulouka Goat Milk. Loulouka Purees. Whether you want to store a package of baby formula or prepare it ahead of time to thaw later, you need to know whether or not it is a good idea to freeze your baby's formula.

Baby formula comes vacuum-sealed so that is is sterile until the moment you open it. After that, you should use the container in the course of a month.