Two sleeping sets of triplets in the Lewis Memorial Hospital in Chicago. The triplets on the left side are two girls and one boy, the triplets on the right side are three boys. Photograph. Around 1935. [Getty Images]

UNITED STATES - CIRCA 1935: Two sleeping sets of triplets in the Lewis Memorial Hospital in Chicago. The triplets on the left side are two girls and one boy, the triplets on the right side are three boys. Photograph. Around 1935. (Photo by Imagno/Getty Images)