Conjoined twins born in Gaza with one body and two heads must be given treatment outside of the strip to survive.
The girls, who were delivered at a hospital in the city earlier today, will have to leave the blockaded enclave or their lives could be in danger.
Doctors are waiting for the Palestinian Health Ministry to decide whether they can be treated abroad.
But in the meantime, Dr Allam Abu Hamda, head of neonatal unit at Gaza's Shifa Hospital, said their situation is complicated.
One looks "okay" but the other is suffering and has had to be placed on a ventilator.
He added: "They cannot be dealt with in the Gaza Strip, so we hope they will be transferred abroad for separation.
"The quicker they are transferred abroad, the better their chances are to be saved."
It is now known where they might go for treatment, but they could be sent to the U.S., Saudi Arabia or Israel.
Photos show how they each have two arms but are fused together at their stomachs.
They each have one working leg, but one of the girls has two feet attached to one leg growing out of his back.
Both share a nappy.
Palestinian nurses are now tending to the girls, whose surname is Ghanem.
Conjoined twins occur around once in every 200,000 live births and the survival rate is usually between five and 25 percent.