"As a result of a severe cold wave and the lack of heating, we have recorded the deaths of six newborns during the past week up until today," agency spokesman Mahmud Bassal told AFP.

Meteorologists say temperatures have fallen to zero degrees Celsius (32 degrees Fahrenheit) in recent days as a cold front has gripped the eastern Mediterranean.

Although an ongoing ceasefire between Israel and Hamas has seen a surge in the volume of humanitarian aid entering Gaza, hundreds of thousands of Palestinians continue to live in tents.

Many are camped out in the rubble of their former homes and are struggling to survive as temperatures drop.

Hamas has repeatedly accused Israel of preventing shelter materials from being delivered to Gaza's 2.4 million people, most of whom have been displaced at least once during the war.

It blamed the deaths of the six newborns on Israel's blocking of aid materials.

"We call on the mediators to take immediate action to stop the occupation's violation of the ceasefire agreement ... and facilitate the entry of essential supplies such as shelter, heating and urgent medical items into Gaza," Hamas said in a statement.

"This is crucial to protect the children of Gaza."