For many Syrians fleeing to Lebanon, their lives have grinded to a halt. The Lebanese government has introduced new measures for refugees obtaining or renewing their residence permits. The UN says more than half of Syrian refugees in Lebanon do not have valid permits, leading to a rising number of newborns going unregistered.

After fleeing the war in Syria, Walid ended up here, at the Shatila refugee camp in Beirut.But with an expired residence permit, he's now afraid to go anywhere - and renewing it costs around 175 euros, on top of registering through the UN or paying a Lebanese sponsor.

Lebanon hasn't ratified the 1951 Refugee Convention mandating protection for refugees. Those, like Uum Mohammad, who can't pay for new permits fear they'll be arrested or deported if they leave the camp.

According to the UN, by the end of March 2016, 56 percent of Syrians didn't have a valid residence permit.For families like Radiya's, it's simply unaffordable.

Of the 4 million residents in Lebanon, over 1.1 million are Syrian refugees, making it the world's highest refugee-to-resident ratio.

Lebanese authorities say the criticism is unfounded, and the measures have in fact made it easier to obtain the permits. But for the time being, refugees feel forced to continue hiding in the camps, far from prying eyes.