The study looked at how clean water, toilets, and handwashing affect children's health on St. Martin's Island in Bangladesh. They found that many households had good drinking water, but not enough toilets. Some people still go to the bathroom outside. Not many people wash their hands with soap after using the toilet. Some families share toilets, and not many have a place to wash their hands with soap. Many children under 5 years old had diarrhea. The researchers found that having good toilets and clean water is linked to children getting sick less often. They say it's important to improve toilets and encourage good hygiene habits on the island.