Pitt concerned for daughter Zahara

Hollywood power couple Brad Pitt and Angelina Jolie have expressed concerns about the health of their adopted daughter Zahara.

The couple, who are currently in Namibia awaiting the birth of their first biological child, are apparently considering returning to the States so that 16-month-old Zahara can be treated for a mystery illness.

Zahara is reportedly not sleeping well and screams when placed on her back, but despite a number of tests doctors in Africa are clueless about the cause.

A source told The Sun "Brad is desperate to take Zahara back to the US for medical attention, but Angelina insists on staying in Africa until their baby is born."