'kid-friendly' is a compound word formed from 'kid' and 'friendly'. 'Kid' originates from Old Norse 'kith', meaning 'young goat', and 'friendly' comes from Old English 'freondlic', meaning 'kind or helpful'.

'Kid' evolved from the Old Norse word 'kith', and 'friendly' from the Old English 'freondlic'. The modern compound 'kid-friendly' emerged in the late 20th century to describe environments or products suitable for children.

Initially, 'kid' referred to a young goat, but it evolved to mean 'child'. 'Friendly' has maintained its meaning of 'kind or helpful'. Together, 'kid-friendly' now means 'suitable for children'.