The United Nations has for the third year put Saudi Arabia and its allies in their military campaign against Yemen on the world body's blacklist of child killers.

According to a report by United Nations Secretary-General Antonio Guterres, in 2018, the Saudi-led coalition fighting in Yemen killed or injured 729 children, nearly half the total child casualties of the year.

The UN chief's report, which was presented to the Security Council on Friday, also states that Palestinian casualties caused by the Israeli regime, mainly its military, hit a four-year high in 2018.

The report shows that 59 Palestinian children were killed 56 by Israeli forces and another 2,756 were injured last year.

Guterres urged 'Israel to immediately put in place preventive and protective measures to end the excessive use of force'.

'I condemn the increasing number of child casualties, which are often a result of attacks in densely populated areas and against civilian objects, including schools and hospitals,' Guterres said in the report, produced by UN Children and Armed Conflict envoy Virginia Gamba and issued in Guterres' name.

The report does not subject those listed to action; however, it shames parties to conflicts in the hope of pushing them to stop killing children.

Diplomats say Saudi Arabia and Israel both have exerted pressure in recent years in a bid to stay off the list, but no to avail.

In reaction to the Friday report, Saudi Ambassador to the UN Abdadllah Al-Mouallimi claimed that 'every child's life is precious' to Riyadh, and questioned the sourcing and accuracy of the report, describing the numbers as 'exaggerated.'