Syrian-British humanitarian worker Mohannad Othman faces a stark choice. It occupies his mind as he drives his two children to Arabic language classes in the Turkish border city of Gaziantep, where he has lived for six years. About 100 miles south of here, in an enclave of Syria’s rebel-held Idlib province—the fate of 90 children and infants, including 20 babies in neonatal incubators—hangs in the balance. They are patients in a pediatric hospital, funded by the World Health Organization but managed by the Turkey-based Al Sham Humanitarian Foundation.