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Theoretically speaking, could green poop be caused by an allergy to breast milk for an breastfed infant starting after four months of breastfeeding? I don't know if that is even possible.

Infant poop is usually yellowish, but what if it were foamy and explosively or dark green and very runny. Could an allergy to breast milk cause this?

I've heard that it could also be the result of a common cold virus infection which may affect the infants stomach. Has anyone else heard about this?

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Unfortunately, questions asking for specific medical advice are off-topic here. You're better off referring to medical professionals, and if you're not happy with your doctor's answer (and I can understand why if, after 3 weeks, you only get "it could be a cold"!), I strongly suggest you seek a second opinion. There are too many possible causes for us to be able to provide you with useful information over the internet. –  Beofett Oct 7 '11 at 20:12
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Without providing specific advice, I remember something a pediatrician said as part of an answer when asking for advice on how to best work with a pediatrician. (It was when I was interviewing for pediatricians). It was along the lines of "Parents often go into great detail describing their baby's poop. As a general rule, as long as they are producing it with normal frequency and it isn't bloody, don't sweat it--it doesn't often help to tell us about it." Apparently they get a lot of poop questions, so much so that he felt he should even bring up the topic in hopes of getting less of them! –  TorgoGuy Oct 7 '11 at 20:25
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All of the other questions with the allergies tag contain general advice. Iirc there was some debate about the "can earth's best foods cause diaper rash?" question, but that one still has enough generality to be useful to a larger audience. Your question as-is is really more along the lines of "here are our symptoms, what are some possible diagnoses?", and is not only of limited use to anyone but you, more importantly it is best answered by a doctor. –  Beofett Oct 7 '11 at 21:09
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@dalle: This might provide answers to your questions. Not being a doctor, if your baby is gaining weight that's a good sign. Can a baby be allergic to breastmilk? –  blunders Oct 7 '11 at 21:37
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Green poop is caused by prevalence of foremilk as opposed to hindmilk in the baby's diet. This might happen if baby changes breasts often or the mother is pumping the milk. Try keeping the baby on one breast longer and pump longer if this is the case. –  jny Oct 10 '11 at 13:49
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closed as off topic by Beofett Oct 7 '11 at 20:12

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