Three newborn triplets have tested positive for COVID-19 on June 17.
The siblings were born prematurely last Wednesday in Mexico where they are currently under close supervision as doctors investigate whether the virus was passed on through their mother.
Two of the siblings, a boy, and a girl are in stable condition, but a second boy is experiencing respiratory symptoms.
It is unclear how serious his condition is. Each of the babies tested positive on June 17, the day they were born.
How the babies contracted the virus has yet to be confirmed.
According to the BBC, while the doctors have reportedly tested both parents for the virus, the results have yet to be released.
Local authorities revealed to the outlet, it is believed the parents may be asymptomatic carriers, and the babies contracted the virus in the womb, as opposed to after their birth.
Mexican health officials are confident on this one point.
“It would be impossible for them to have been infected at the moment of birth,” State Health Secretary Mónica Liliana Rangel Martínez told the BBC.
And if that is the case, it means the mom would have passed the virus down to the babies through her placenta.
Since the onset of the pandemic, while rare, such cases have been documented since the beginning of the pandemic. The virus has also been known to cause premature delivery which may or may not have been the case here.