And when your little one is a bit older, you can ask your partner or babysitter to offer the bottle at room temperature or even colder; many babies find that fine, and it's super handy!
We also used the bottle warmer, but once the number of bottles went down because of the fruit and veggie puree we added, we started using the microwave more too! Much more practical and faster!
This info is on the website of the Nutrition Center
How to prepare the bottle
Wash your hands.
Make sure the bottle is clean. If the bottle is not clean, your child can get sick.
Follow the instructions on the package when preparing. Use the scoop that comes with the package for the right dosage.
You can use tap water. It is not necessary to boil it first.
Warm the bottle in a pan with warm water, in a bottle warmer, or in the microwave.
Do not warm the bottle milk more than 30 to 35°C. Always check the temperature of the milk with a drop on the inside of your wrist.
Swirl the bottle a bit if you warm it in the microwave. The outside can feel colder than the contents.
Warm a bottle at max 600 Watt. A bottle of 100 ml warms for 30 seconds, a bottle of 150 ml for 45 seconds, and a bottle of 200 ml for 60 seconds in the microwave.
Check on the inside of your wrist if the milk is not too warm. Give the bottle to your child immediately if the temperature is good.