Anyone using WeightAtBirth?

Hello ladies,

I was wondering if any of you have used an app called WeightAtBirth that claims it may predict the baby's weight at birth. The maker of the app says it uses scientifically proven methods to do the predictions. I've downloaded the app (iPhone) and it seems Ok. It uses two methods to make the prediction, one based on one ultrasound estimation of your baby's weight, the other based on maternal weight gain during third trimester, but I just wanted to get a second opinion from someone who has already used it.

Thanks.