chū shēng zhī dú bù wèi hǔ
lit. a new-born calf has no fear of the tiger (idiom)
fig. the fearlessness of youth
初
chū
at first
生
shēng
to be born
之
zhī
(possessive particle, literary equivalent of 的[de5])
犊
dú
calf
不
bù
no; not so
畏
wèi
to fear
虎
hǔ
tiger