"Multiple births" refer to the situation when a woman gives birth to more than one baby at the same time, such as twins, triplets or more. Full definition
Competition among fertility clinics does not appear to increase rates of multiple births from fertility treatment by promoting more aggressive embryo transfer decisions. (en.wikipedia.org)
The increase in multiple births means that discounts and special offers are harder to come by. (verywellfamily.com)
The data from the 1960s, meanwhile, provided a statistical baseline for natural multiple birth rates without medical intervention that the team also used in their estimates. (sciencedaily.com)