Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Hurt my sons feet

The underside of the tray has ridges. My son would get excited and kick his feet against them, causing redness and bruising. The underside of the tray is all mechanism and nothing kid safe. I have to buy something else.I think this issue may have been addressed in the new model. Theyve redesigned the underside I think...