It is not necessarily bigamy for a wife to have children outside marriage. The crime of bigamy refers to the bigamy committed by a spouse, or the marriage committed with the knowledge that another person has a spouse; Having children outside marriage has nothing to do with the conviction of bigamy. The conviction of bigamy requires proof that both parties have obtained marriage certificates or live together in the name of husband and wife.
 Legal basis:
 Article 1042 of the Civil Code of the People's Republic of China
 Arranging marriages, buying and selling marriages and other acts that interfere with the freedom of marriage are prohibited. It is forbidden to ask for property through marriage.
 Bigamy is prohibited. Persons with spouses are prohibited from cohabiting with others.
 Domestic violence is prohibited. Abuse and abandonment among family members are prohibited.