It is increasingly hard for Iraqi aid workers to help tens of thousands of people caught up in fighting in Baghdad, reported BBC according to Unicef.
The Sadr City area of the capital has seen the worst clashes between government forces and Shia militia.
The UN children's agency says over 150,000 people there are having difficulty accessing clean water, food and other essential services.
The Iraqi government says almost 1,000 people have died in recent fighting.
Most of those have been civilians, and aid agencies say around 60% of them are women and children.