Before the child's birth, the girl had been accepted as a daughter-in-law, and therefore Vidarbha actually married her when he grew up

Expressions researched:
"Before the child's birth, the girl had been accepted as a daughter-in-law, and therefore Vidarbha actually married her when he grew up"

SB Canto 9

Long, long ago, Jyāmagha had satisfied the demigods and Pitās by worshiping them. Now, by their mercy, Jyāmagha's words came true. Although Śaibyā was barren, by the grace of the demigods she became pregnant and in due course of time gave birth to a child named Vidarbha. Before the child's birth, the girl had been accepted as a daughter-in-law, and therefore Vidarbha actually married her when he grew up.

SB 9.23.38, Translation:

Long, long ago, Jyāmagha had satisfied the demigods and Pitās by worshiping them. Now, by their mercy, Jyāmagha's words came true. Although Śaibyā was barren, by the grace of the demigods she became pregnant and in due course of time gave birth to a child named Vidarbha. Before the child's birth, the girl had been accepted as a daughter-in-law, and therefore Vidarbha actually married her when he grew up.