WHO and UNICEF blame war, inequality as well as complacency for 20 million children missing immunisation.
Militia fighting Boko Haram militants release 894 children, including 106 girls, as part of 2017 deal against recruiting child combatants, UN officials say.
It's the biggest one-day rise since the current outbreak in Democratic Republic of Congo was declared last August, health ministry says.
As the conflict entered its fifth year on Tuesday, figures showed at least half a million children have dropped out of school with many doing odd jobs to sustain themselves and their families.
Hundreds of thousands of civilians have been killed or displaced in the conflict, mainly by regime airstrikes targeting opposition-held areas.
Three months ago, UN Chief Antonio Guterres announced a series of breakthroughs, which are apparently yet to come into effect as a new UNICEF report says at least eight children are still killed or injured in Yemen every day.
A centre in Turkey's capital is looking to provide refugee children with the tools they need to build a new life.
Around 103 babies out of 1,000 live births die in Nigeria's Masaka town.
Sandwiched between Syria and Jordan, eight children died at the refugee camp in the last month alone, as a result of both the Assad regime and Jordanian government sealing the border, blocking medical and food supplies.
Pakistan spends less than one percent of its GDP on health and experts say that's kept the high infant mortality rate from improving.
Several thousand children in this region have been declared witches who are 'possessed by evil spirits' but the government is unable to curb the practice, fearing a political backlash.
A new UN report indicates that thousands of children, mostly boys, have been recruited by the armed groups and thousands of more, most of them girls, are sexually exploited and abused during the five years of fighting in Central African Republic.
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