My mantra as a new mom to any advice given to me, whether it was liked or otherwise, was "I'll take that under consideration." if I liked the advice, I'd look into it further, if not, I let the idea leak out of my head no longer to be thought about (which was most advice).
Sometimes, it might help to leave the room to feed the baby because YOU may need a break, but it may not be realistic with every feed for a month.
With my MIL, it sometimes helps to talk about we are in agreement on, reminding her that I know she clearly raised good kids as i chose her son to be the father of my kids. I guess give a little sugar to her to improve the taste of vinegar you may have in your mouth ;-)
I agree with pp about doing what works for you; you do not need to be apologetic as it is your home. Do as you feel is right to keep the peace for your family's needs.