初生

newborn / nascent / primary (biology)

at first / (at the) beginning / first / junior / basic

to be born / to give birth / life / to grow / raw / uncooked / student

lit. newborn calves do not fear tigers (idiom) / fig. the young are fearless

see 初生之犢不畏虎|初生之犊不畏虎[chu1 sheng1 zhi1 du2 bu4 wei4 hu3]

lit. a new-born calf has no fear of the tiger (idiom) / fig. the fearlessness of youth