Fifteen-month-old conjoined twins were successfully separated after an 18-hour surgery at Seattle Children’s Hospital.

The hospital announced in a press release that after almost a year of preparation and months after the surgery, twins Ally and El “are thriving at home” and receiving additional treatment as they grow and develop.

The twins were joined at the pelvis and brought to the hospital in the fall of 2024 for an initial appointment. The separation surgery took place Feb. 28, 2025, with a team of 30-plus healthcare providers helping with the “highly complex and delicate” operation.

According to Cleveland Clinic, experts estimate only 1 in every 50,000 to 1 in 100,000 pregnancies involve conjoined twins. Conjoined twins are connected by body parts or organs.

Conjoined twins A

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