Facts about safe warming of breast milk and formula in baby bottles

We want you to be able to microwave baby milk with confidence.

The number of foras, articles and statements on the internet about what you should and should not do as a parent is huge. A lot of the information out there has more to do with superstition, personal preferences and pseudoscience than with facts.

We believe asking questions, looking at evidence and using common sense is important to separate belief from evidence. We have done a lot of research while developing milkymeter, in order to find out what actually happens inside a microwave, and what is good and bad for babies and for breast milk. Below we have collected information - and some links to scientific research on the topics.


It is safe to heat baby bottles in microwave if temperature is observed

In the microwave, the bottle gets warm really quickly and if you are not careful, you may overheat the bottle and risk burning your baby. This is why health care professionals such as patients.info advise you to shake the bottle well before testing the temperature to make sure that the formula is not too hot.

In fact, this is why we invented milkymeter! Milkymeter tells you when the milk temperature is right and you should open the microwave and shake or stir the milk.

When using milkymeter you can heat the bottle safely in the microwave and feed baby in seconds. Without the risk of burns from too high temperatures and with all the important nutrients preserved in the milk.


How can hotspots be avoided

Microwaves heat unevenly, and you problably have heard never to heat baby bottles in the microwave.

The reason for warning against warming baby bottles in the microwave is the risk of overheating. This is the reason for developing milkymeter, that enables you to know the temperature development in the microwave and stop the heating process when the temperature is right.

When you stop the microwave at the right temperature, hotspots will not have time to develop. There will be areas in the milk warmer than other areas, however, milkymeter has a number of digital temperature sensors and measures temperature several places in the bottle and calculates the average temperature. This means there are no risk of burns and that nutrients in the milk are not at risk for overheating.

After heating, simply stir the milk with milkymeter or swirl the milk around in the bottle to even out temperature differences. In this way there are no hotspots.

Nutrition and heating of breastmilk. Scientific studies

Sharron Bransburg-Zabary, 1 ,* Alexander Virozub, 2 and Francis B. Mimouni 3, Umberto Simeoni, Academic Editor: "Human Milk Warming Temperatures Using a Simulation of Currently Available Storage and Warming Methods." . 2015; 10(6): e0128806.



Wardell J, Wright A, Bardsley W, D’Souza S. “Bile Salt-Stimulated Lipase and Esterase Activity in Human Milk after Collection, Storage, and Heating: Nutritional ImplicationsPediatr Res 18: 382–386.PMID: 6718097. 1984


Lassen, Anne and Ovesen, Lars. "Nutritional effects of microwave cooking." Nutrition & Food Science 95.4 (1995)


Pediatrics : September 1992, VOLUME 90 / ISSUE 3Madeleine Sigman-Grant, Gloria Bush, Ramaswamy Anantheswaran: "Microwave Heating of Infant Formula: A Dilemma Resolved"

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