Our ds has just started on formula at 4 months. We have the Tommy Tippee bottle which should indicate when the milk is too hot, but the indicator is permanently pink, even when cold (I think it may have got damaged from using near boiling water). How would you describe the feeling of milk when it is at the right temperature? I know you should be able to tell by squirting some onto your arm, but what is the difference between warm and too warm??