Children cannot be harmed by listening to Mozart. The research may not be finished yet on the value of the Piano Sonata in C Major, but your child will benefit from the combination of well selected images and music. The problem with some research into the Mozart Effect is that it is based upon results extracted from an adult population. In the case of the original Mozart study, the pool of subjects was composed of college students. So far, we cannot prove that classical music makes any difference for young children, but it is still important for them to be exposed to music.
Music can stimulate awareness and the sense of rhythm.
These Babyscapes videos are well produced and are well worth playing. Certainly, it will be interesting to experiment with your own children to see their response to these Miracle of Mozart images, designed to enhance sensory stimulation.