More than 20 people have been killed and more than a million driven from their homes following Typhoon Hagupit, which struck the Philippines over the weekend.
The typhoon caused landslides, heavy rain and high winds.
Unicef said poor sanitation and clean water were the biggest threats to public health and has been providing water and hygiene kits, water pumps, generators, water storage and treatment facilities to people in affected areas such as Tacloban, Manila and Cotabato.
It also plans to give counselling to children suffering anxiety and fear as a result of the typhoon, as well as setting up temporary schools for those forced to leave their homes or whose schools have been closed.
The typhoon weakened to a tropical storm with maximum sustained winds of 87mph and gusts of 106mph, still a potentially deadly storm, according to forecasters.