During a C-section at Israel’s Sourasky (Ichilov) hospital, doctors bypassed a tumor that was blocking the baby’s airways. Only then could they cut his umbilical cord to avoid oxygen starvation. The doctors practiced the complex operation using a 3D-printed model of the baby’s neck.

https://www.timesofisrael.com/halfway-through-birth-tel-aviv-doctors-open-babys-tumor-blocked-airways/