Hi J.,
I have 4 lil momkies & 1 on the way..& I know what you're going through.
Some signs to look for would be:
Is 2 solid meals not enough, or not doing it...Is my son still hungry?
Is he wanting more bottles/breastmilk? If so feel free to let him sit in with you at dinner time & feed him a jar of baby food and then give breastmilk/formula after because formula/breastmilk is babies main source of nutrition.
Another book that I strongly reccomend is "On Becoming Baby Wise II" by Gary Ezzo & Robert Bucknam M.D.
This book goes into setting a routine for your child & having Parent Directed Feeding (PDF)I've used this book as a reference since my 2nd baby &it has helped a lot!!
It also helped set up a routine to get my babies sleeping thorugh the night by the 3rd month.
I hope that I was of some help :)
~Aloha V.