Cerebellar Hypoplasia (cer·e·bel·lar hy·po·pla·sia) is a disorder found in cats and dogs which causes jerky movements, tremors, and generally uncoordinated motion, just like ataxic cerebral palsy in humans. A cat with CH often falls down and has trouble walking or cannot seem to walk at all. CH in cats is non-progressive, meaning it does not get worse with age. Symptoms appear at birth, though they may not be noticed until the kitten starts walking at a few weeks of age. Like symptoms that come on suddenly or later in life are not CH.