The Palestinian health minister said on Thursday that 29 children had died from starvation-related deaths in Gaza in recent days and that many thousands more were at risk.
"In the last couple of days we lost 29 children," Palestinian health minister, Majed Abu Ramadan told reporters, describing them as "starvation-related deaths."
Asked to react to earlier comments by the UN aid chief to the BBC that 14,000 babies could die without aid, he said: "The number 14,000 is very realistic may be even underestimating (the scale)."
On the other hand, the Israeli army issued an evacuation warning on Thursday for 14 neighbourhoods of northern Gaza, as it pressed a renewed offensive that has drawn international condemnation.
The warning came hours after the United Nations said it had collected and begun distributing around 90 truckloads of aid in Gaza, the first such delivery since Israel imposed a total blockade on the territory on March 2.
Under global pressure for an end to the blockade and the violence, Israeli Prime Minister Benjamin Netanyahu said he was open to a "temporary ceasefire" in Gaza, but reaffirmed the military aimed to bring the entire territory under its control.
In an Arabic-language statement on Thursday, the military said it was "operating with intense force" in 14 areas in the northern Gaza Strip, accusing "terrorist organisations" of operating there.
The army issued a similar warning for northern Gaza on Wednesday evening in what the army said was a response to rocket fire.
It later announced three more launches from northern Gaza, but said the projectiles had fallen inside the Palestinian territory.
After Israel announced it would allow in limited aid, the United Nations "collected around 90 truckloads of goods from the Kerem Shalom crossing and dispatched them into Gaza", said Stephane Dujarric, spokesman for UN chief Antonio Guterres.
Agencies