I'm at a loss. My son is 5 1/2 months old. I've been feeding him pumped milk since he was 8 weeks old in preparation of my return to work. He did fine with it. I started exclusively pumping when he entered day care at 12 weeks. I also had to introduce one formula feeding a day. He was still fine with everything. That one feeding turned into two, and then three (he was up to eating seven bottles a day - six ounces each. I have a BIG boy!). He was eating both well.
Two weeks ago my menstrual cycle started for the first time since I gave birth. I have noticed a decrease in the amount of milk I produced during that time, but I'm back to my normal output. This week my son is now completiy rejecting my milk. I'm devastated and don't know what to do. My milk is lighter in color than it used to be. He just screams and cries whenever I (or his daddy or daycare provider) try to give him a milk bottle. He sucks the formula bottle right down! I'm still pumping to maintain supply, but he won't drink the milk. Any thoughts? Has anyone heard of such a thing before? Could the return of my cycle changed the components of my milk to make it taste bad to him? Any advise would be appreciated!