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Can you mix refrigerated breast milk from two different days?

Mixing Refrigerated Breast Milk: What You Need to Know
When it comes to the delicate process of feeding infants, many parents often wonder about the safety and best practices for storing and mixing breast milk. One common question is whether it is safe to mix refrigerated breast milk from different days. The answer is nuanced and hinges on several important guidelines.
Safety Guidelines for Mixing Breast Milk
According to experts, it is generally not recommended to mix breast milk from different days. The primary reason for this caution is related to the potential for bacterial growth and the degradation of the milk’s nutritional quality. Breast milk can be safely stored in the refrigerator for up to four days, but once it has been expressed, its properties begin to decline over time.
If you do need to combine milk from different pumping sessions, the best practice is to ensure that the milk being added is from the same day. This means that if you have expressed milk throughout the day, you can safely combine those containers as long as they are all from the same 24-hour period.
Chilling Fresh Milk Before Mixing
If you have freshly expressed milk that you wish to combine with previously refrigerated milk, it is crucial to chill the fresh milk first. This step is essential to prevent the rewarming of the older milk, which can compromise its quality and safety. Experts recommend placing the fresh milk in the refrigerator for about 30 minutes to one hour before mixing it with the older milk.
Labeling and Storage Practices
When mixing breast milk, it is also important to label the containers with the date of expression. This practice helps ensure that you use the milk within the recommended storage guidelines, minimizing waste and maintaining safety.
In summary, while it is safe to mix breast milk from the same day, combining milk from different days is not advisable due to the risks associated with bacterial growth and nutrient degradation. Always remember to chill fresh milk before mixing and to adhere to proper storage practices to keep your baby’s milk safe and nutritious.

Can I combine refrigerated breast milk from different days?

Can I mix fresh breast milk with older breast milk? Mixing freshly expressed breast milk with already cooled or frozen milk is not advised because it can rewarm the older stored milk. It is best to cool freshly expressed milk before combining it with older, previously cooled or frozen milk.

Does breast milk have to be the same temperature before mixing?

The American Academy of Pediatrics previously stated: “Mothers can mix warm milk and cold, or even consider pooling milk from 24 hours together, which may help even out variability in nutrients due to pumping time or breast emptying (which influences fat content of the milk).”

Is it okay to mix left and right breast milk?

Combine the milk expressed from the right and left breasts into one container, seal it, and cool it. Let’s call the milk from this pumping session milk 2. Once cooled, you can pour milk 2 into the container of milk 1. If this is enough for a full feeding, great!

How long can refrigerated breast milk sit out?

Freshly expressed or pumped milk can be stored: At room temperature (77°F or colder) for up to 4 hours. In the refrigerator for up to 4 days. In the freezer for about 6 months is best; up to 12 months is acceptable.

How long can breast milk be left out after refrigerated?

Storing breast milk after expressing
Freshly expressed or pumped milk can be stored: At room temperature (77°F or colder) for up to 4 hours. In the refrigerator for up to 4 days. In the freezer for about 6 months is best; up to 12 months is acceptable.

Can you mix left and right breast milk?

Combine the milk expressed from the right and left breasts into one container, seal it, and cool it. Let’s call the milk from this pumping session milk 2. Once cooled, you can pour milk 2 into the container of milk 1.

What is the 5 5 5 rule for breast milk?

Something I recommend to moms is the 5-5-5 rule. Try and use milk within five hours at room temperature, five days in the fridge, and by five months in the freezer.

Can you refrigerate breastmilk twice?

Don’t put leftover breast milk back in the fridge to use later or refreeze it. It’s important to follow safety guidelines for breast milk because bacteria can grow in it if you leave it out for too long.

Can I pump into the same bottle all day?

Milk stays good for 4 hours if you leave it at room temperature after pumping. So, you can pump into the same bottle within the 4 hours timeframe. Once the 4-hour timeframe has elapsed, you can either give the milk to your baby or store it in the fridge or freezer for future meals.

Can you mix milk from two different breasts?

Yes, you can mix left and right breast milk when pumping. It’s common to produce different amounts of milk from each breast, and breast milk from both breasts is the same and can be combined without any concern.

Natasha Lunn

Tash is an IBCLC and Business Coach helping fellow IBCLCs create fun, profitable businesses that are more than just an expensive hobby. Before becoming an IBCLC and starting her private practice - The Boobala, Tash graduated as an Osteopath in 2008 and has been in Private Practice in South West Sydney. She was also a volunteer Breastfeeding Counsellor and Community Educator with the Australian Breastfeeding Association for 6 years. Through her business, Your Lactation Biz, Tash coaches and creates products to help new and seasoned IBCLCs build businesses that suit their personality and lifestyle.

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