Fighting for their lives in an incubator, these incredible pictures show the battle these conjoined twins are going through.
The unnamed girls share a chest and stomach which experts say is very rare.
However, they have separate heads, hearts, lungs and spines.
They were born at al-Shifa hospital in Gaza yesterday and are the first conjoined twins in the area since 2013, local reports suggest.
Dr. Ayman al-Sahbani, head of the emergency and media department at the hospital told Ma’an news agency that the family refuse to publish any names.
It is unsure whether any operation to seperate the pair is planned.
The unnamed girls, born in Gaza, share a chest and stomach which experts say is very rare. However, they have seperate heads, hearts, lungs and spines
Medical literature states conjoined twins develop when a woman produces just one egg that doesn’t fully seperate after being fertilised.
The developing embryo then begins to split into identical twins during the first few weeks but stops before the process is complete.
Experts from the University of Maryland say the partially separated egg then develops into a conjoined foetus.
There is believed to be nearly a dozen types of conjoined twins – of which one common form is omphalopagus.
These are where twins are connected from the breastbone to the waist and share many organs – but rarely a heart.
Most conjoined twins don’t survive because their organs are unable to support their bodily needs.
They were born at al-Shifa hospital in Gaza yesterday and are the first conjoined twins in the area since 2013, local reports suggest
It is estimated that 40 per cent are not alive when they are delivered while 35 per cent die within a day of being born.
CONJOINED TWINS: THE FACTS
Births of conjoined twins, whose skin and internal organs are fused together, are rare.
They are believed to occur just once in every 200,000 live births.
Approximately 40 to 60 percent of conjoined twins arrive stillborn, and about 35 percent survive only one day.
The overall survival rate of conjoined twins is somewhere between 5 percent and 25 percent.
For some reason, female siblings seem to have a better shot at survival than their male counterparts.
Although more male twins conjoin in the womb than female twins, females are three times as likely as males to be born alive.
Approximately 70 percent of all conjoined twins are girls.
Source: University of Maryland
However, advances in technology are helping to give conjoined twins a better outlook than ever before.
Their birth comes a month after two US twins conjoined at the crown of their heads were separated.
Jadon and Anias McDonalds, from Chicago, were operated on in a life-threatening 27-hour procedure.
They were pictured earlier this week looking at each other for the first time following their recovery from surgery.
It is believed to be the fastest recovery for separation of craniopagus twins (conjoined at the head) in history, beating the previous record of eight weeks.
Jadon is already ready to move, as he is now vibrant, active, and energetic, pulling at his bandages and playing with anyone who enters the ward.
Anias, who was already struggling before the operation, is having more difficulties, regularly contracting viruses and infections.
But their surgeon Dr Philip Goodrich said he believes Anias will pull through, and he thinks Jadon is a great force of energy for him at this time.