I wish I had have known this when I was breastfeeding. My husband had a massive accident when DD was just 9 weeks old and, with all the stress, I gradually started weaning at 4 months until, by 6 months she was completely formula fed. If I had have known this info I may have tried harder to keep up with the BF. It is easier to say in retrospect though. I would have at least liked the info so that I could have made more of an informed decision.