"worldwide children" is correct and usable in written English.
For example, you could use it in a sentence like this: "We must do our part to protect the rights of worldwide children."
Although the rate of extreme poverty is declining worldwide, children are disproportionately impacted, according to two new reports.
Worldwide, children are suffering from the effects of trafficking, pornography, prostitution, rape and abuse.
Worldwide, children and adolescents are widely affected by obesity and its comorbidities [ 3- 6].
Worldwide, children are routinely vaccinated with a live attenuated varicella vaccine containing the Oka vaccine (vOka) strain of VZV, originally developed in Japan (1 – 3 ).
Rotavirus infection is a leading cause of gastroenteritis in children <5 years of age worldwide; children with severe dehydration and electrolyte imbalance require hospitalization (1 ).
And worldwide, children are still being exposed to lead in even larger numbers, often as a result of industrialization in formerly "underdeveloped" countries [ 21].
Worldwide child mortality from malaria, pneumonia and diarrhoea remains high.
While the rate of children at work is on the decline worldwide, child labour remains a substantial global challenge.
New survey figures reported by UNICEF showed solid progress, with worldwide child deaths at 9.7 million per year – down from almost 13 million in 1990.
Worldwide, child and adolescent mental health has increasingly become a priority, particularly in the fields of mental, neurological and substance-use disorders [ 3].
"The incidence of T2DM [type 2 diabetes] has increased dramatically worldwide in children due to the epidemic of child obesity.
