T.,
I never gave my children food from a jar. I fed them whatever we were eating but ground up in a food mill. The "first" foods I introduced were baby cereal, pureed carrots, pureed butternut squash, pureed sweet potatoes. By the time my babies were 6 months, whatever I was serving for a meal, went straight to the food mill. The purpose of the "stages" you are referring to on the jars is how thick or thin the foods are. Let your baby be your guide...if he takes thin food really well, make it a bit thicker. If he refuses it or gags then you know he is not ready for thicker foods. Personally, I would ditch the baby foods and start feeding your little one whatever you are eating. It's easier...and cheaper for you in the long run. What I did was prepare a large batch by steaming the veggies, pureeing them (in blender or food processor) and freeze them in ice cube trays. I defrosted what I needed and didn't wasted much. I hope I have helped and my suggestions are just suggestions. Every mom must do what she feels is right for her and her baby. Good luck. Feeding is so much fun at this age.