A member asked:

When does the placenta attach to the uterus?

5 doctors weighed in across 2 answers

Immediately: As soon as the developing embryo is implanted in the uterus and the placenta begins development.

Answered 2/4/2012

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4-5 days: About 4-5 days after the sperm and egg meet (conception), the fertilized egg implants in the uterine lining and begins placenta development. The placenta is very functional by 12 weeks.

Answered 9/11/2019

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