This is a great program if you only have one child. For any more than one, you have to pay to add them. Also, to see the exact percentile after one year old, you have to pay. That part, I dont mind so much, but having to pay for more than one child is what dropped me down to three stars. If youre willing to pay (Im not) it says they will even compare your kids growth to one another - I dont know if that is just putting two line charts on one graph, or what, but that is the other "perk" of paying for the app. Deleting the app, as a mom of more than one child, I already have enough expenses, dont need to pay for this app. I will keep my kids height and weight listings in a notepad entry - the doctor gives me the percentiles for free at the appointments anyway!