Hot water in a bowl or bottle warmer. Longer but safer.

We use a thermos that we carry around on the go. My sister taught me to put in 2/3 of the bottle with cold water and when ready for a feed top it up with the hot water from the thermos. That way the water will be lukewarm whenever bub needs a feed.

We didn’t have a microwave for a short time. So I filled the bottle 2/3s with milk, boiled the kettle and topped the bottle up,with hot water. Worked out to be the perfect temp

If you use a microwave, take the top off. It heats more evenly. We used to use a jug of very hot water. Especially if the bottle had been pre-mixed and refrigerated, or thawed after being frozen. To be honest with you I have never heated a bottle in a microwave.

Yes microwaves aren’t ideal as they don’t heat evenly. I bought a large thermos and kept hot water in it to use throughout the day to make up formula. I would use some hot water from the thermos and some cooled water to get the right temperature (eventually figured out the ratio with trial and error). I would always still test on my wrist each time though. I found using the thermos saves electricity as you’re only boiling the kettle once a day to fill it, as opposed to using the microwave or whatever, each time you’re making up a bottle.

For formula I used room temp filtered water in summer. In winter when it’s a bit cooler I put the designated amount of filtered water into the bottle first, microwaved for approx 30-40 seconds depending on your microwave. Checked to see if the mls were still correct when I took it out of microwave to make sure there was no evaporation of water. If some has evaporated just top up with room temp filtered water, Then added the correct number of scoops of formula and shook it until all dissolved. Test on wrist. Should only be luke warm.

I didnt heat bottles that often but i was told to always give the bottle a shake and test it on the sensative part of your hand, just that area between the thumb and the index finger, that flappy bit of skin there, you will know in a instant if its to hot for your bubs. If it feesl skin temp its just right. But if it sting even in the slightest its way too hot. I found using the micowave for 40 seconds just right, but have also tried heating in a pot of water or while on holiday a bottle warmer which took a few minutes. A quick way to cool it down quickly is to sit it( the bottle) in iced water and check after a minute or so.