Child brides, however, often aren't psychologically prepared for marriage.
Wasila Umaru, 14, was married last week to 35-year-old Umaru Sani, according to assistant superintendent Musa Magaji Majia.
But when Umaru invited a dozen friends to celebrate in northern Ungwar Yansoro village, near the city of Kano, the teenager slipped the deadly chemical into a rice dish.
Umaru died the same day along with friends Nasiru Mohammed and Alhassan Alhassan, while another female victim, Indo Ibrahim, died in hospital hospital while receiving treatment.
Wasila admitted buying the poison at a local market and putting it into the food.
'The suspect confessed to committing the crime and said she did it because she was forced to marry a man she did not love,' Majia said.
Umaru is cooperating with police and likely will be charged with culpable homicide, according to Majia.
Child marriage is common in Nigeria and especially in the mainly Muslim and impoverished north, where the numbers increase in times of drought because a bride price is paid and it means one less mouth to feed.
Fifty percent of Nigerian girls living in rural areas are married before they turn 18, according to the U.N. children's agency. (Continue Reading.)