TEL AVIV — Baby Reem is hungry. She is 5 months old and grasping for her mother’s milk. She doesn’t understand that her mother is dead, and she is the lone survivor of an airstrike that killed her entire family.

Reem Jehad Abou Haya was pulled from the rubble of her family’s home in the Gaza Strip city of Khan Younis on Aug. 12. It’s a miracle that she survived a strike that killed her parents, siblings and cousins, but a bittersweet one, as she now faces a life shadowed by their…