U.S. Customs and Border Protection said the boy displayed signs of illness Monday and was taken with his father to the hospital, where he was diagnosed with a cold and a fever and prescribed amoxicillin and ibuprofen. According to officials, the eight-year-old boy, who has not been named, was given multiple medical examinations by doctors before being released with prescription medications.
He was released on Monday afternoon but returned to the same hospital in the evening with nausea and vomiting.
Felipe González Morales, the United Nations special rapporteur on the human rights of migrants, said on Monday that American authorities "must ensure that an in-depth, independent investigation" is conducted.
Felipe "always wanted a bicycle", and in the USA he wouldn't have to endure the poverty and lack of opportunity in Guatemala, she said. While in the hospital, the girl was revived after going into cardiac arrest but she died less than 24 hours later.
Jakelin and her father handed themselves in to United States border agents in New Mexico in early December.
González Morales said the USA needs to stop detaining children, either entering the country with their families or unaccompanied, because "as repeatedly stated by a series of United Nations human rights bodies, detention of children based on their migratory status is a violation of worldwide law". The agency "is considering options for surge medical assistance" from the U.S. Coast Guard and may request help from the federal Department of Health and Human Services, the Department of Defence and the Federal Emergency Management Agency.
Felipe Gomez Alonzo, 7, is seen near Laguna Brava in Yalambojoch, Guatemala in this undated photo.
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The unnamed boy is the second youngster to die in detention this month.
He was among nearly 25,000 migrant children in USA custody, according to McAleenan - the greatest number ever recorded.
"This is an extraordinarily rare occurrence", McAleenan said to CBS This Morning of the recent child deaths.
The US Customs and Border Protection (CBP) agency has not released an official cause of death.
"Children in the custody of the Trump administration are dying, and the best the secretary of Homeland Security can do is blame those who seek open borders" and "parents".
A spokeswoman for the Gerald Champion Regional Medical Center said in a statement that privacy regulations prevented the hospital from sharing information about an individual patient and could not comment on the case.
His mother, Catarina Alonzo Perez, is still in Guatemala and spoke to local newspaper Prensa Libre, saying she wants her son's remains to be sent back to their home but wants her husband to be allowed to stay in the U.S.
González Morales has twice requested an invitation from the USA government for an official visit but said he has not received a reply.