I.P.
try fortifying the formula. Formula - when mixed at the normal instructions is about 20 calories per ounce. You can see a nutritionist to get recipe to increase calories per ounce. I work with a nutritionist in Menlo Park (email me if you want the contact info). She helped me get my sone from 5th percentile to 25th percentile by upping the calories on my breastmilk and formula from 20 calories per ounce to 27 calories. You can also talk to the nutritionist about adding fat into the "spoon fed" meals. I add olive oil into veggies and something called "Duocal" into foods which ups the calorie intake. In one tablespoon of duocal there is 42 calories. Good luck!