Why are goat's babies called 'kids'?

[Dina88]

English Grammar Tests, Elementary Level

ESL/EFL Test #131 "Real Life: Farm Animals (1)", question 8

Goats produce milk for their babies that are called ..........

(a) calves
(b) kids
(c) lambs

English Grammar Tests, Elementary Level

ESL/EFL Test #131 "Real Life: Farm Animals (1)", answer 8

Goats produce milk for their babies that are called kids.

Correct answer: (b) kids

Your answer was: correct
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why we call the goat's babies kids

[Mister Micawber]

Kid: c.1200, "the young of a goat," from O.N. kið "young goat," from P.Gmc. *kiðjom (cf. Ger. kitz). Extended meaning of "child" first recorded as slang 1599, established in informal usage by 1840s.
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Native English teacher at Mister Micawber's

[Dina88]

thnx alot