Yes you can. Please put in the freezer ASAP. You can put freshly pumped bm in fridge for up to 3 days before putting in freezer.
You may. Do remember the rule. 3hour in room temperature, 3Days in fridge, 3months in freezer.
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This article should help https://sg.theasianparent.com/how-to-warm-breast-milk-from-fridge/?utm_source=search&utm_medium=app
Thanks!
Huang Shujia