You are given a sentence in Galician. Your job is to translate the Galician sentence into English.

Cando erades fetos, axudáronlle ao voso cerebro a formar as circunvolucións.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
When you were fetuses, they helped your brain to fold itself.