Ramayana
सद्योपलब्धिर्गर्भस्य प्रसूतिः सद्य एव च । सद्य एव वयःप्राप्तिर्मातुरेव वयस्समम् ॥ 7-4-31 ॥
The boon was that the conception of their offspring should be instantaneous, the delivery likewise instantaneous, and the attainment of full age also instantaneous, each child becoming at once equal in age to its mother.
english translation