Hi i have 5 children and what i have done with all of them is. After sterilising the bottles i boil the kettle and then leave it to sit for 30 mins then make all the bottles at once but make sure that all those bottles get used before 24 hours. It isn't practical for people to make a bottle just when its needed who could listen to a baby crying for 30 mins for a feed. Doing the bottles this way has never done my kids any harm. The reason for making bottles just when you need it is to prevent bacteria and meningitis. The water cannot be reheated before the milk formula is added. It has to be freshly cool boiled water. So if you feel that you can make 1 bottle at a time then thats great but if you can't then make as many bottles as can or want to at 1 time. 

Hope this has helped.

You're suppossed to make each bottle up as neede but this is not very practical!  The reason is that milk powder is not sterile and the water needs to be 70 degrees C!  You are suppossed to boil the kettle leave to cool for 30 mins then pour the water in the bottle, mix the powder and cool down rapidly to drinking temp!  I find this impossible!  I strerilise my bottles and add water the night before!  When it comes to feed time I microwave the water for 70 seconds (depends on your microwave) til it's hot, not warm, then add the powder and cool as normal!  This way the water is hot enough to kll the bacteria but I don't have to wait half an hour for the kettle!

Hi ya - i breast fed first time round and am expecting number 2, willbe bottle feeding this time. Just wondering what the advice is now re making feeds, can you make them up and store in fridge or are you supposed to make them as needed, and if so does that mean you have to use freshly boiled and cooled water, or can you put water in pbottles ready, add powder and the re-heat? sorry for the babble!