This book tells real story of children health who are belonging to the developing country, where children under 15 years of age are still suffering from curable diseases like diarrhea especially parasitic infestation. The book also tries to explain the variables that directly and indirectly related with these infestation. In this book the target age group is under fifteen years children, because these children are more frequently exposed toward the outer environment. They have lack of knowledge regarding healthy and hygienic foods. Water is basic need of human being if the water we used for drinking are itself contaminated then there is more chances to get disease so, this book explains what type of water is more prone toward parasitic infestation and also other major human behaviors like washing hand, consuming raw foods, income sources of family etc. This book also tries to find out whether the medication used today for the parasites are effective or not. Though data is not enough to explain whether the traditional medication are still good or not but it shows some variation after and before treatment thus, the data will be useful for future study on same.