Calendar understands at least 11 children have had to go elsewhere for operations after heart surgery was suspended at Leeds General Infirmary.
Surgery was suspended last week but it's been announced it will resume next week.
NHS England and the Care Quality Commission have confirmed that Children’s Heart Surgery Services at Leeds General Infirmary are safe.
Children's heart surgery is set to resume at Leeds General Infirmary after days of uncertainty over its future.
The Children's Heart Federation says the interests of management at the LGI have been "put ahead of critically ill children".