An 18-hour surgery involving more than 30 Seattle Children’s Hospital (SCH) healthcare providers successfully separated 15-month-old conjoined twins, SCH announced Wednesday.

After preparation for the surgery began in Oct. 2024, Seattle Children’s successfully performed its surgery to separate the conjoined twins, Ally and El, on February 28, 2025.

“When I met with Dr. Smith and the other Seattle Children’s specialists for a surgery consultation, I knew my family would be in great hands,” Sam, the twins’ mother, said. “Their expertise and approach to care really impressed my husband and me and made our decision to have the surgery at Seattle Children’s an easy one.”

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