After implantation: Actually two questions. 1. As soon as the placenta implants, it starts to create capillary connections with the lining of the uterus. The main function is to bring nutrients to the fetus. 2. However, it changes size and shape throughout pregnancy. So, its form will change. "fully formed" is not important issue as it changes as needed for delivering nutrients.
Answered 1/17/2015
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