Do you plan on warming bottles?

Anais
To those of you who have bottle fed or plan on it, do you plan on warming your bottles or feeding them to your baby room temp? I always warmed my first sons bottles which was an issue sometimes when out and about. Now I'm pregnant with baby number two and I've notice 2/3 of my sister in laws don't warm up their formula bottles! It's served to a happy baby at room temp! I never even thought of this as an option but I'm intrigued! 
**I also understand that when going from breast to bottle some babies demand it heated, but my question is to moms who's babies will take it room temp or who are going to try.

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