a child born in wartime, esp the illegitimate child of a soldier
war baby in American English
noun
1.
a child born or conceived in wartime
2.
an illegitimate child born in wartime of a father in the armed forces
Word origin
[1900–05]This word is first recorded in the period 1900–05. Other words that entered Englishat around the same time include: Young Turk, burnout, elder statesman, hookup, throwaway