03/05/2026
The CDC came out with breastmilk safety temperatures in 2010... It's unimaginable what moms did before this (sarcasm) ๐ It was updated again in 2019 and 2023...
Enter a new small, 2026 study... testing milk from bottles after babies fed from them. Researchers measured bacterial levels over time at room temperature and in the fridge...
๐ญ Hereโs what they found:
โข Bacteria increased right after feeding (which makes sense โ babyโs mouth introduces normal bacteria).
โข But there was no meaningful increase at 4 or even 8 hours, whether the milk was kept around 68ยฐF (20ยฐC) or refrigerated.
โข Noticeable growth showed up after 24 hours at room temperature.
โข Refrigerated milk remained stable and low-risk for up to 24 hours.
What this suggests for ๐ต๐ฒ๐ฎ๐น๐๐ต๐, ๐ณ๐๐น๐น-๐๐ฒ๐ฟ๐บ babies:
โ A partially used bottle can likely be refrigerated and reused within 24 hours.
โ If needed, it may be reasonable to keep it at room temperature for several hours (up to about 8 hours ๐ถ๐ป ๐๐ต๐ถ๐ ๐๐๐๐ฑ๐).
โThey also found that unused pumped milk was often ๐ฎ๐ฐ๐ณ๐ฆ ๐ด๐ต๐ข๐ฃ๐ญ๐ฆ at room temperature than the commonly quoted 4-hour limit, with minimal bacterial growth in many cases.๐คฏ
๐ฅบBillions of breastmilk tossed down the drain....
Important note.
If you have a ๐ฝ๐ฟ๐ฒ๐บ๐ฎ๐๐๐ฟ๐ฒ ๐ฏ๐ฎ๐ฏ๐, ๐ฎ ๐บ๐ฒ๐ฑ๐ถ๐ฐ๐ฎ๐น๐น๐ ๐ณ๐ฟ๐ฎ๐ด๐ถ๐น๐ฒ ๐ถ๐ป๐ณ๐ฎ๐ป๐, ๐ผ๐ฟ ๐ฎ ๐ก๐๐๐จ ๐ด๐ฟ๐ฎ๐ฑ๐๐ฎ๐๐ฒ, ๐๐๐ฟ๐ถ๐ฐ๐๐ฒ๐ฟ ๐ต๐ฎ๐ป๐ฑ๐น๐ถ๐ป๐ด ๐ฟ๐๐น๐ฒ๐ ๐ฎ๐ฏ๐๐ผ๐น๐๐๐ฒ๐น๐ ๐๐๐ถ๐น๐น ๐ฎ๐ฝ๐ฝ๐น๐.
Breastmilk is incredibly resilient. ๐ Does this change how you feel about leftover milk?
https://www.medrxiv.org/content/10.64898/2026.02.13.26346179v1.full