Glass jars in the freezer...? - Mothering Forums
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#1 of 10 Old 07-31-2008, 12:38 PM - Thread Starter
 
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I want to freeze some breast milk; but I don't want to use those plastic bags that you can buy for this purpose. I have some small glass jars with metal lids; and I was wondering if anyone knows whether or not it's safe to freeze glass with fluid in it...?

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#2 of 10 Old 07-31-2008, 01:38 PM
 
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Leave a good amount of head-space at the top of the jar to allow for the liquid to expand, and you should be fine

You can also freeze milk from several pumping sessions in the same container in layers, as long as the new milk is well cooled first. Just don't pump into a container that already contains frozen expressed milk, or add warm freshly-expressed milk into a container of frozen milk. You knew that, though, I'm sure (We sleep-deprived post-partum moms do odd things sometimes...)

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#3 of 10 Old 07-31-2008, 02:22 PM
 
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Yup, like the pp said, just leave a lot of room for expansion. I freeze sauces, jams, soups, etc, in jars with no problems.
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#4 of 10 Old 07-31-2008, 02:53 PM - Thread Starter
 
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Quote:
Originally Posted by lovesdaffodils View Post
...leave a lot of room for expansion...
Define: "a lot"...(please)....? Are we talking like, 50% of the jar, or more like 25%...?

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#5 of 10 Old 07-31-2008, 04:49 PM
 
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i have always done about 20-25%

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#6 of 10 Old 07-31-2008, 05:15 PM
 
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20-25% is probably a good guideline. :
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#7 of 10 Old 07-31-2008, 06:21 PM - Thread Starter
 
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Thank you.

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#8 of 10 Old 08-03-2008, 07:41 AM
 
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I haven't done this with breast milk, but I use mason jars to freeze liquids and in addition to plenty of headspace, I also make sure that the liquid is chilled before freezing and flip the interior lid (i.e., not the band), keeping the band loose, until the liquid is frozen to keep the lid from sealing. Once it's frozen, I invert the lid and tighten the band all the way. I mention this because even if you're not using mason jars, some jars get a little bit of a seal from even slight cooling of their substances and I think that's contributed to broken jars in my past.

P.S. You can also get very small mason jars that might be good for smaller amounts of milk.
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#9 of 10 Old 08-03-2008, 11:47 PM
 
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I did this often and just because it worked out for thawing purposes, left about 50% empty. Never had a problem.
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#10 of 10 Old 08-09-2008, 08:43 PM
 
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I use glass jars to freeze stuff all the time, I usually fill them up about 75% of the way. Little pesto jars are perfect for breast milk and baby food.

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