Nicoletta Lanese is a news editor on Live Science's health desk. She first joined the publication in 2019 as a staff writer. She holds degrees in neuroscience and dance from the University of Florida and a graduate certificate in science communication from the University of California, Santa Cruz. Her work has appeared in The Scientist Magazine, Science News, The San Jose Mercury News and Mongabay, among other outlets.
In a rare case, a mother in Alabama gave birth to two sets of identical twins in back-to-back pregnancies.
The first set of twins shared the same placenta — the organ that connects the uterus to the umbilical cord and supplies fetuses with nutrition and oxygen — but each had his own amniotic sac — the thin-walled, liquid-filled sac that surrounds fetuses as they develop. Twins with one placenta but two amniotic sacs are known as monochorionic-diamniotic twins, and they occur at a rate of about 3 to 4 in 1,000 live births, according to the Columbia University Department of Obstetrics and Gynecology .
Specifically, they represent about 1% of twin pregnancies and less than 0.1% of all pregnancies, according to Columbia University .
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