Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: not so good afterall

We received this chair as a gift in our baby shower. I moved out of the US when my baby had three weeks, and we finally got the chair when he was two months old. The first thing that did not work was the vibration panel, we checked batteries and all, but it just did not vibrate, it only produced a strange noise.However, we still loved the chair because our son looked comfortable and happy on it, and he loves to be put on it to watch videos. However, since he learned to sit straight he also discovered that he can pull his torso down, so I've found him three times screaming, with his hands on the floor and half of his body tied to the chair. I am putting some books on the legs of the chair to keep it stable, I just think that this chair does not work well when children learn to sit straigh. Any suggestions to solve my problem?