Both these issues have caused unease in Scandinavia, where critics say that the authorities risk complicity in child abuse.
Of 31,000 asylum seekers who arrived in Norway in the past year or so, 10 of those aged under 16 -- the minimum local age for sex or marriage -- were married and four had children, the Norwegian Directorate of Immigration (UDI) said.
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And similar problems have occurred elsewhere.
In February, Danish Integration Minister Inger Stojberg said that she would "stop housing child brides in asylum centers" after a review found dozens of cases of girls living with older men.
Couples younger than 18 would not be allowed to live together without "exceptional reasons", said Sarah Andersen, spokeswoman for the Integration Ministry.
"There will never be exceptions in cases where one side is below the age of 15," she said.
In Denmark, 15 is the minimum age for sex and for marrying with a special permit. Denmark took in 20,000 asylum seekers last year.
In January, after reports by Swedish Radio, authorities said that at least 70 girls under 18 were married in asylum centers run by municipalities including Stockholm and Malmo.
"This is worrying," Sweden's Ombudsman for Children Fredrik Malmberg wrote in a blog, urging better child protection.
"We know that children fleeing are very vulnerable both for human trafficking and to become targets of forced marriage."
In Sweden, the lowest age for sex is 15 and marriage 18.
PLAN, a non-governmental organization which helps children in developing nations, believes there are 15 million child marriages every year and says developed nations should never approve.
"If the girl is aged under 16, the minimum age for sexual intercourse in Norway, the child bride refugee should be separated from her husband even if they have children together and even if they say they want to stay together," said Kjell Erik Oie, head of PLAN Norway.
Poor parents in developing nations sometimes marry off their daughters when times get hard to reduce food and other bills.
In the north Norwegian county of Finnmark, authorities are investigating circumstances surrounding a Syrian girl, now aged 16 who already has one child and is pregnant again, police lawyer Jens Herstad said.
"We still have to hear the husband's account," he said.