No, when the pregnancy is with fraternal twins (and not identical twins), each one comes from a different embryo and therefore each one will develop its own placenta and its own amniotic sac.
This is known as a bicorionic-biamniotic pregnancy.
Read the full article on: What differs in pregnancy with fraternal twins or identical twins? ( 41).
Andrea Rodrigo
B.Sc., M.Sc.
Bachelor's Degree in Biotechnology from the Polytechnic University of Valencia. Master's Degree in Biotechnology of Human Assisted Reproduction from the University of Valencia along with the Valencian Infertility Institute (IVI). Postgraduate course in Medical Genetics.
