My son is 9 months and was 20 pounds from 6-9 at birth. If you look at the label Gerber jars are only fruits and only like 20 or so calories a piece- thats not enough in my opinion. My boy eats Gerber and cereal at the babysitters while I work b/c its easier, along with Good Start/EBM. At home I nurse him and give 1 bottle a day. He loves to feed himself O's, Kix, Gerber puffs, shredded cheese, toast w/ low sugar jelly, Gerber baby cheetos, or anything dry. I try to make most of his food when he is at home so he eats mashed/blended veggies and fruits, whole milk yogurt, tortilla pieces, loves cottage cheese, rice, pasta, and just about anything else. I would try your son with all different things to see what he likes, and go for high fat, low salt/sugar if possible. I also like those Gerber graduate pasta meals because they have meat, pasta, and veggies all in one but he should be good at eating softer foods first probably. My son's Ped says he can have anything except shellfish and peanut products. Good luck- if you need more suggestions let me know- I am also an OB RN.