Under the Hindu Marriage Act, 1955, concealment of pre-marriage pregnancy by the respondent can make…

Section 12(1)(d) of the Hindu Marriage Act makes a marriage voidable where "the respondent was at the time of the marriage pregnant by some person other than the petitioner". The petitioner must have been ignorant of the fact at the time of marriage, must file within one year, and must not have had marital intercourse with consent after discovering it.

The marriage is not void; void marriages are only those under section 11 (bigamy, prohibited degrees, sapinda relationship).