The following method for warming a baby bottle, is a milk heating method using hot and cold water. Its based on 37 Degrees Celsius temperature (blood temperature) which is the same temperature as breast milk. If you follow this method precisely (based on mathematics) then the milk or warmed baby formula will be ready to drink, and baby will be happy.
This is based on 6th form maths!!
1. Keep a large jug of previously boiled-then-cooled water in the fridge at 4 Degrees Celsius Ensure that you tip un-used water out of the jug after 12 hours and that you thoroughly wash the jug before adding more water.
2. Make some boiling hot water, at 100 degrees Celsius.
3. Have all your bottle equipment already cleaned and sterilised.
The following simultaneous equation tells you how much volume of boiling water (at 100 degrees) to add with how much volume of cold water (at 4 degrees) to get a warm safe mixture of water at 37 degrees. You can then add your formula powder to the bottle, shake up, and give to baby to drink.
Make x = mLs of 100 degree water
and y = mLs of cold water and z = final mixture then:
x + y = z
100x + 4y = 37z
we know z = 200
so x + y = 200
y = 200 – x
100x + 4y = 7400
100x + 4(200-x) = 7400
100x + 800 – 4x = 7400
96x = 6600
x = 68.7 mLs of 100 degrees boiling water water
y = 131.3mLs of 4 degrees cold water
4. Add the boiling hot water 68.7 mls. Then add 131.3 mLs of cold water. Add the required formula dose. Shake well.
5. Always refer to the formula tin for the dose to feed baby.
6. Always check temperature before feeding to baby. It should feel the same temperature as your skin.