I'm hoping to mix feed, DS is 2 months and has been EBF up until now. I haven't made up a bottle of formula in 5 years and I'm wondering if the advice has changed. I used to use hot boiled water to make a bottle, but on the tin it says "cool" water, as per the instructions here. It then says "warm to feeding temperature", so I guess this means allow the water to cool completely first. Why? Help!