For calculating weight gain during pregnancy, Z-Baby follows the research data by IOM (Institute of Medicine) 2009: Weight gain during pregnancy: Reexamining the guidelines
[14]. Weight gain during pregnancy is based on the BMI (Body Mass Index) before pregnancy. BMI can be calculated from the weight (in kilograms) divided by height squared (Height in
meters). Weight gain during pregnancy is based on IOM 2009 as it can be seen in Table I. This table is applied for calculating the appropriated weight for each week and plot line charts of
the total appropriated weight during pregnancy. User is also able to plot her own weight to update weight data dynamically as well using Android Plot API [15] as shown in Fig.3(A).