From: guynoir

Don't feed a cat human baby food, especially not a sick cat. One very
common ingredient in baby food is onion powder (even the "all meat"
varieties): Onions, garlic and other allium vegetables are toxic to many
animals, including cats. The toxic ingredient is N-propyl disulfide,
which causes Heinz-body hemolytic anemia.

Actually there are brands that do not have onions in them. Baby food has
helped in some cats so I would not rule it out as a short term solution to a
cat that's not eating..

Lauren
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See my cats: http://community.webshots.com/album/56955940rWhxAe
Raw Diet Info: http://www.holisticat.com/drjletter.html
http://www.geocities.com/rawfeeders/ForCatsOnly.html
Declawing Info: http://www.wholecat.com/articles/claws.htm