Just ignore it. Do whatever you want to do. There are pros and cons for every situation. I breastfed for 8 months, but now I'm pregnant and my milk supply has decreased so I had to start supplementing formula. I'm happy that I did it though, mainly because it saved money and was convenient during travel and outings. However, it pretty much made me solely responsible for feedings and dad was less involved... which by 7/8 months gets annoying! It seemed like even when I had pumped the milk, I was still the one who ended up bottle-feeding! I know that I was never breastfed, nor were my brothers and sisters, and we are all perfectly healthy. Make your own choices and just respond to the comments with a simple "thanks, i'll think about it".