Whoa, folks, cool it on the judgement. I have done it, and it's not as awful as y'all are making out.
When DS was about 2 months old, pediatrician told me to put him on vitamin drops. So I did (I didn't know any better ) Unfortunately, I inadvertanently picked the kind out with iron in them instead of the TriViSol.
Well, M, up to that point was an every-nursing pooper. After a week of vitamins, he STOPPED.
After a few days, he started to get uncomfortable.