The bottom and the top I have not seen before…. (One semi-skipped beat) But I have it go crazy on my sometimes (wet wrist and such). Sounds like you are going to Dr, show them and it may help skip some primary steps. You will like have to get fitted for a real one and it will be continuous and more accurate (and detailed).
Gift it early…. It would be fine, but imagine the joy of now. These things are inly going to be used a couple years, add a couple months usage time😎.