[Set of photos] American woman gives birth to octuplets What is this concept?

According to foreign media reports, a California woman gave birth to six female and two male octuplets in one breath on January 26. The birth process was caesarean section, but it took some time to hold the octuplets from the stomach one by one. Fortunately, the doctors and nurses in charge of the delivery conducted several rehearsals, and the whole delivery process took only five minutes, and the eight babies weighed between 820 grams and 1.47 kilograms.