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Child means a person who, if a male, has not completed 21 years of age, and if a female, has not completed 18 years of age. it is treated as child marriage if the contract between any two people of which either one or both parties is a child. If a male person above 21 years contracts a child marriage shall be punishable for two years imprisonment and/ or a fine which may extend to rupees 1 lakh. The same punishment will be given to person who performs, conducts or directs a Child Marriage Act.,2006. If the marriage is voided the girl should paid maintenance by male up to the age of her 18th year or up to the time she gets marriage. If the male is minor his parents should provides such maintenance. The government will take care of the children whose marriage is cancelled. The dowry and gifts are to be returned after the cancellation of the marriage.

Disadvantages of child marriage 

1) Underage pregnancy 
2)Provision for trafficking and sale of girls 
3)Pushing the unmatured into family system
4)Increased abortions, premature births which results not only infant mortality but also the death of mothers.
5)Handicapped child births or dead child births.
6)Mental as well as physical health problems.
7)Obstacle for study.
8)Hurdle for physical growth(especially regarding female)
9)Become child labouers for family maintenance 

hope it helped u :)