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The placenta develops from specialized cells of the embryo, which forms after conception ( becoming pregnant). The placenta grows along with the baby and reaches approximately 4cm in thickness and 18 cm in diameter near the time for delivery.( after 37 weeks of pregnancy). It grows because of its rich blood supply, and where this is interrupted, placental growth ( hence also the babys growth) slows giving a small baby and placenta. The placenta actually moves and sometimes can block the outcoming baby- this is now picked up early by scans. Hope it helps. Ravi

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17y ago

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