Beyonce and Jay Z's twins arrived ahead of time. The babies were born prematurely and are being treated for jaundice, TMZ has reported.
The pair have not left the hospital since arriving eight days ago; it was previously reported doctors had opted to keep them in for a 'minor issue.'
The siblings will have spent most of their first days under 'bili lights,' phototherapy designed to eliminate high levels of bilirubin in the blood.
Jaundice is quite common among newborns, especially preterm births; twins are more susceptible since they are rarely carried to full term.