My honest opinion would be the best advice my friend gave me with my firstborn. Dont ever heat your baby's bottles.
Have the water at room temp and give your kid milk at room temp.
Wherever you are, you never have to worry about heating bottles. I did it with my second also and will do it again.
Your baby is happy with bottle that is quick to make. Your baby will never get a bottle that is to hot or cry because it is not ready and he is hungry.
Me: 42 low AMH
DH: 50 all well
2012
IUI #1 BFN
Nov 2012 IUI #2BFP! M/C 7 weeks
2013
IUI #3, #4, #5, #6
IVF #1 Sept 2013 BFP! 4 weeks So Blessed! Oct 2013 10 weeks no heartbeat. Evac. Heartbroken
2014
IVF #2 IUI #7 IVF#3 IUI #8 BFN
IUI #9 Sept 2014 BFP!!!!! 4 weeks. Thank you God, you have answered our prayers
28 May 2015 Little Boy born.