@profemilyoster: We all hate wasting breastmilk—pouring out a half-finished bottle can feel painful. The good news: new data suggest it may be safe to use for longer than older guidelines recommend. Read the full findings on ParentData.org, and share your breastmilk storage experiences in the comments.

Emily Oster
Emily Oster
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Monday 22 June 2026 21:09:22 GMT
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minti131
Minti :
Moms been doing this lol, official data just catching up
2026-06-23 01:21:45
399
jon.o98
Jon O :
Sleep for 6 hours?!?!
2026-06-25 21:31:29
95
gorthedon0
GorTheDon :
can you post your sources please. and is there any data on if refridging, rewarming old breastmilk would cause any accelerated bacterial growth?
2026-06-23 00:13:10
236
samanthamae36
Samantha Mae :
where is the data coming from?
2026-06-28 03:28:45
1
taylorthulson
Taylor :
What if it’s been warmed?
2026-06-22 23:44:06
22
tikkkkktoccc
Tikkkktokkkkkkkkk :
Smell test. If it smells fine it’s fine for the baby. Just me?
2026-06-25 18:30:41
51
thebookwormsbazaarco
curatorofbookwormsbazaar :
where do I find this data?
2026-06-23 00:08:50
17
sarah.asaly
Sarah Asaly :
What about after warming/defrosting?
2026-06-22 22:08:05
21
cookiesjeanette
Jeanette Kraus :
I feel like this is a fairly simple study that could’ve been done ages ago
2026-06-26 17:30:40
21
lifeindraftednotes
Lifeindraftednotes :
Girl I don’t throw away anything, he’s getting it again tomorrow 😂
2026-06-25 19:41:58
17
donnathedeadest
donnathedeadest :
First time mom and I hated this advice. I went off of cooking methods. If you used some and didn’t use the rest. WITHOUT BACKFLOW. put it in the fridge like you would leftovers. My baby never had issues with this.
2026-06-25 05:37:49
15
jdog90000
Julien :
This is misleading. This is a pre-print and they only specifically looked at milk from 17 breastfeeding moms while over 20 were from formula. Please don’t mislead until it’s published. Also, authors said to not use this data for general use, there needs to be more data
2026-06-29 08:55:48
5
sweet.carolion
Caroline Elizabeth :
Ope I’ve just been using it anyways 🤣
2026-06-25 13:39:13
23
luizafsousa
Luiza :
Thank you!! It broke my heart to throw even 1oz of milk that I worked so hard to make and pump 😅
2026-06-23 03:30:44
33
pepperthecorgipup
user7307362726196 :
This study doesn't appear to have been peer-reviewed yet from what I can tell.
2026-06-23 03:17:33
9
puudaaa7
puudaaa :
six hours ??? lol I wish
2026-06-24 23:48:20
7
queerlygaycatmom
Just videos of my cat :
I tried to find the article on your website and I couldn’t. Could you please post that and/or your sources? This is a huge claim.
2026-06-23 00:45:13
23
madelyn.28
Madelyn :
Does the new data also support reheating it (ie baby drinks some, you put it back in the fridge for several hours, can you then reheat before offering again?)
2026-06-26 02:27:44
11
caro194525
Caro :
Is this only for freshly expressed breastmilk? Or does this include heated milk?
2026-06-27 03:24:57
4
mistyannl
Misty :
What about formula ?
2026-06-25 12:23:41
0
sbrownie6
sbrownie6 :
What about mixing fresh (warm) pumped milk with cold milk stored in the fridge? Can we just mix it or do you have to cool the fresh one first to be same temp?
2026-06-29 20:27:43
2
aubrey.rose.s
Auberz :
Been doing this from the get go with my 1st kid in 2021 because I REFUSED to throw away milk. She literally never got sick & EVERYONE told me I was doing it all wrong. 😆 Looks like I was just ahead of the knowledge curve.
2026-06-26 19:27:50
4
ulfahinthewild
Ulfa in the wild 🦖 :
I’ve been doing this anyway 😮‍💨 taste fine. Smells fine. Looks fine. 🤷‍♀️
2026-06-23 18:48:56
6
brittanywhite44
Brittany Marshall :
with my son i froze what he didn't finnish and used it for milk baths
2026-06-28 17:11:43
2
allbeautynoguilt
Allbeautynoguilt :
I knew this
2026-06-27 05:49:06
1
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