UNICEF said the violence has disrupted water supplies in areas of southern Yemen and that sewage is overflowing in some locations, raising the risk of disease outbreak.
Hospitals are struggling to treat large numbers of wounded with insufficient supplies and some medical facilities have come under attack, the agency. It said at least three health workers, including an ambulance driver, have been killed in attacks.
"They are being killed, maimed and forced to flee their homes, their health threatened and their education interrupted," Harneis said in a statement, released yesterday in Amman, Jordan.
The agency said at least 74 children have been killed and 44 wounded since March 26, when a Saudi-led air campaign against Yemen's Shiite rebels and their allies began.
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The fighting pits allies of the country's embattled president, Abed Rabbo Mansour Hadi, against Shiite rebels known as Houthis and their allies, military units loyal to Hadi's predecessor, ousted autocrat Ali Abdullah Saleh.
Yesterday, fighting intensified in Aden, Yemen's second-largest city, leaving streets littered with bodies. The rebels and their allies were making their strongest push yet to seize control of the port city, which has been the main bastion of support for Hadi.
The fighting raised doubts over the possibility of landing ground forces from the Saudi-led coalition to carve out an enclave to which Hadi, who fled the country two weeks ago, could return.
"Conditions are very dangerous right now," UNICEF's Dr. Gamila Hibatullah in Aden was quoted as saying. "Hospitals are overflowing, and even ambulances have been hijacked."
The agency estimated that more than 1,00,000 people have left their homes in search of safer areas.