In the United States, roughly one out of every 83 births is a twin birth. Of those, about 72 percent are fraternal twins. Fraternal twin births have soared since 1980, from about 19 in every 1,000 ...
The following is a summary of “Relationship between relaxin-2 levels in serum and mode of conception in twin gestations: A prospective cohort study,” published in the December 2024 issue of Obstetrics ...