I use baby food jars too. You can easily vent them by punching a hole with a clean nail. Paint the ragged edge with clear nail polish to minimize rust. Then just cover the hole with a NexCare Sterile Spot type band aid. You don't have to vent motherflasks. But if you are smart and take the advice of Newflasker, venting will allow you to grow them out longer in one flask.
DJ, Is there a standard size baby food jar that the Phytotech lids will fit? I'd like to use the clear lids but there are many different varieties of baby food out there. Tips on brand or size would be appreciated.
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