"They are so small that at first you may miss them. Their newborn cries are impossibly soft, asking for their mother's nourishment. Seven-day-old Rida and Nida, twin girls, are among the youngest of the 900 refugees at a school-turned-refugee camp in Sukkur, Pakistan. Born after the floods hit Pakistan, they may not be thriving, but they are surviving. Their mother, Maryum, is grateful her daughters are still alive amid the chaos of Pakistan's worst floods in 80 years, but she does not feel the joy of new motherhood. ""I'm worried about them,"" said Maryum. ""We don't have anything. No clothes, no home, nothing."" Maryum dipped her fingers into a bowl of water and touched Nida's lips. Nida, who is smaller and weaker than Rida, lapped up the water with her small mouth. ""This is the cleanest water we have,"" Maryum said. Cleanest does not mean clean. The water at this refugee camp is still untreated, but the children are drinking it in the sweltering heat and humidity. It's why 18-month-old Zabair is ill with a water-borne disease. A yellow IV remained attached to his small left hand as volunteer doctors tried to treat him. With enough clean water, many children can recover. The problem in Pakistan's growing humanitarian crisis is access to that clean water."