no objectTo abduct a very young child; (now chiefly) (derogatory) to marry or have a sexual relationship with a much younger partner; compare "cradle-snatch".
Origin
1920s.
Definition of baby-snatch in US English:
baby-snatch
verb
no objectTo abduct a very young child; (now chiefly) (derogatory) to marry or have a sexual relationship with a much younger partner; compare "cradle-snatch".