Baby food could be ok, but be sure that it does not contain onions, as they are toxic to animals. (and I have to wonder if they are toxic to humans too)
Probably the pureed meats would be best, but do read the label.
I couldn't get the wet puried enough to go through the syringe. The vet couldn't said they had done all they could do and gave the diagnosis as cancer. If she doesn't have cancer maybe some of this will help.