Fill the baby bottle warmer with the same amount of drinking water or baby food as the amount of milk you want to warm up (for example, to warm up 125ml/4oz of milk, you need to use 125ml/4oz of drinking water. For baby food you can fill the bottle warmer with drinking water upto the same level as the baby food in the container). If you want to heat up a large amount of milk (>180ml/5oz) or baby food, the maximum water level is approximately 1cm/0.4 inches under the rim of the baby bottle warmer (which corresponds to adding 160ml/4.5oz of drinking water). An accurate water level ensures correct warming performance.
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