"An estimated 2,300 children traveling with the migrant caravan now in southern Mexico need protection and access to essential services like healthcare, clean water and adequate sanitation," the release said.
Many of the children and families in the caravan are fleeing gang violence, extortion, poverty and limited access to quality education and social services in their home countries in northern Central America, the release said.
On Monday, US President Donald Trump vowed to cut off US aid to Honduras, El Salvador and Guatemala over their failure to stop migrants from leaving their countries to come illegally to the United States. Washington is also pressing Mexico to halt the caravan before the group reaches the US border.
According to UN estimates, the caravan includes more than 7,000 asylum seekers, but the Mexican Interior Ministry and Defense Ministry said earlier in the week that just over 3,600 people were left.