If your wife really wants to keep using boiling water to kill any bacteria in the milk, how about this method:
This would be for a 7oz feed and you might have to mess around with the quantities to get the temperature right.
- Before you go to bed, boil 4 oz of water and leave it in a sterilised bottle to go cold.
- When baby wakes, boil the kettle and add 3oz of boiling water to a new bottle.
- Then add some of the cold water from the other bottle to bring it to about 70 degrees which is the right temperature to add formula powder.
- Add the 7 scoops of powder to the hot bottle.
- Mix it up and the heat of the water will kill any bacteria in the powder.
- Then add the rest of the cold water to bring the bottle down to the right temperature for drinking and to increase the total volume of water to 7oz.
As I said, you might have to mess with the quantities, I've never tried it so I don't know if 3oz of hot water would leave the full thing at the end the right temperature. It combines the best of both worlds though and everything is sterile.