B.M.
Well you could find the local health center. They would probably do it for free. But why? Are you worried about your baby? If you are worried then call your doctor. If you are just wondering your baby's weight then just stand on your scale, get off, pick up baby and get back on. It's not going to be 100% accurate but pretty darn close. This is what i do when I'm wondering how much my chunky babies have put on in between appointments.