There will be evidence of it in the baby's first poop (the meconium)
are you asking this question about you and your pregnancy?
We don't judge here, we try to inform you. It would be best to be honest with your doctor.
To barbieann85, we don't bash people here. So try to keep it to yourself.
And I see that you had been smoking, so someone could ask you the same question.
"how long does cocaine stay in a pregnant womans placents "
I'm going to assume the last word is "placenta" I'm not here to judge or ask questions. You asked a question and hopefully I can help answer it. I don't know if your asking for yourself or a loved one...I guess it doesn't matter. I just want to say, if your asking for a loved one...please relate the information on how dangerous it is to use cocaine while pregnant. There is tons of published literature on it. Im posting a little clip that may address your original post, however...please read the whole article that's at the link below it.
"Cocaine is metabolized (converted to inactive forms) by the enzyme cholinesterase, which is decreased in many, but not all, pregnant women and in newborns. The inactive metabolites are excreted into the gastrointestinal tract and eliminated by the kidneys. As a result of the latter, evidence of the drug's presence in the body may be detected in the urine for 2-3 days after use by nonpregnant women and up to 10 days in newborns exposed prior to delivery."
http://futureofchildren.org/publications/journals/article/index.xml?journalid=69&articleid=498§ionid=3387
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Here is another article/study called:
"Effects of cocaine on the placenta."
http://www.ncbi.nlm.nih.gov/pubmed/9949220
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Here's more:
"Cocaine only stays in your system 3 days with occasional use. It will remain in the placenta throughout your pregnancy and will also be in your baby's first stool(meconium)"
"It will still be the same..3 days with one time use. Chronic or excessive use will take 5-7 days to be out of the system. Cocaine can stay in the placenta well after it is out of you and your baby's system."
http://drugs.blurtit.com/q2963518.html
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Good Luck and God Bless