We switched to formula from ebf about 3 weeks ago. DD cut her first tooth and we started formula at the same time. She got a runny nose at this time. The runny nose stopped and she's had this gunk in the back of her throat since. It causes her to gag and throw up at least once a day. I've been cleaning up almost every day for the past 3 weeks. It dawned on me that the formula might be causing this congestion and she's not actually sick. I wrote my doctor this morning and told her my thoughts and she said I could try soy formula. Have any of you guys had trouble with formula causing congestion? What worked to fix it? I'm apprehensive about soy because of the estrogen stuff I've read about it. Would soy really make a difference? Thoughts?