Better to put an ice pack in the thermal bag? If no ice pack can just put some ice in plastic bag. I usually try to be more careful with baby's milk. Better to warm it. Heard that cold milk is not good for baby's stomach. Some babies dislike cold milk too (like my LO). If just pump, the standards say ard 6 - 8 hrs but Singapore is so hot and humid so I always try to finish it within 2 hrs. Hope this helps. :)
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