Scale works. App is too basic (and abandoned!)
I‘m rating this 2-stars mainly because the app appears to be abandoned - last time it was updated was 2 years ago. There are so many basic features missing: Import/export data, graph for custom date range (currently you can only view prior week, prior month, or All), quick Unit (cm v. inches) toggle (currently you have to go to Settings), View graph of multiple kids at once (hello… twins!), to name a few.
Unfortunately you don’t have the option to use a different app with the Smart Baby scale, so you are stuck with the app.