Newborn triplets in Mexico have tested positive for coronavirus in an "unprecedented" case, according to local health authorities, APA reports citing BBC News.
Medical experts are investigating whether the disease could have been passed on through the mother's placenta during pregnancy.
Two of the babies, one boy and one girl, are in a stable condition in a hospital in San Luis Potosí state.
But the second boy is receiving treatment for a respiratory condition.
A spokesperson for the state's Health Safety Committee said contagion in multiple births had not been detected anywhere globally and so the case would be investigated.
A very small number of newborn babies have been known to pick up the virus after birth, but health officials say they do not believe this is what happened in this case.
State Health Secretary Mónica Liliana Rangel Martínez said: "It would be impossible for them to have been infected at the moment of birth."
However, the parents are currently being tested, with authorities saying they may have been asymptomatic.
The triplets - born prematurely on 17 June in Mexico - all tested positive for coronavirus on the day of their birth.
Coronavirus in newborns is unusual, but not unheard of. Babies can catch the virus after birth if they have close contact with anyone who is already infected. Coronavirus might also be passed on in the womb from mother to baby via the placenta.
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