Banana, sweet potato, and avocado are good first solids. Green beans aren't very nutritious and would be hard to mash up. Of course I am talking about real food not baby food. You never need baby foods, cereals, cookies, puffs, ect. They are expensive, processed, and most don't taste good.
You don't have to spoon feed. You can put mashed food in front of the baby and let the baby go for it. It's better than spoon feeding.
You can start from 4-6 months. Around 4 months may be ok for the formula fed baby. It's good to wait until 6 months or even longer for the breastfed baby because breastmilk is the best thing for babies.
www.kellymom.com is a breastfeeding website but it has good starting solids info for all babies
at 6:23 PM on Dec. 7, 2009