Yes, it is safe to put breastmilk back in the fridge after it has been warmed up. You can store it in the fridge for up to 24 hours.
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Thawed frozen breastmilk can be safely stored in the fridge for up to 24 hours.
no
Thawed frozen breast milk can be safely stored in the fridge for up to 24 hours.
Yes. If it's only been out three hours and it's still in the packaging, it's fine. Take some and put it back in the fridge as soon as you can, but probably even longer than that would be okay. If it's out of the packaging, it would still be safe, but probably dry out and perhaps unappealing.
Yes, it is safe to store formula milk in the fridge. You can store it for up to 24 hours after it has been prepared.
The time it takes for a fridge to cool down after the door has been left open can vary, but typically it can take anywhere from 30 minutes to a few hours, depending on factors like the temperature outside the fridge, the amount of food inside, and the efficiency of the fridge.
You can, especxially if you are going to be storing it for more than a few hours or if it has already been frosted.
Only if it's been kept in the fridge overnight.
It isn't fresh anymore. I'd be leery of it.
The general rule is that once jam, or any perishable food, has been opened it should be returned to the fridge within 2 hours.