I honestly already feel like a bad mother. I open up an app that says my baby should weigh five…

I honestly already feel like a bad mother. I open up an app that says my baby should weigh five pounds now and she only weighs 3lbs 14 oz. I'm seriously so nervous about her size. Even though they are saying it isn't a big deal it still concerns me plus I don't want an ultrasound every week they make me more stressed.