A personal favourite from a knowledgable Spanish paediatrician who references the updated 2006 WHO Child Growth Standards:

http://www.amazon.com/gp/aw/d/1780660057/ref=redir_mdp_mobile

I'm growing more accepting of the fact that, with free access to nursing and a wide variety of nutritious, whole foods, my son (16 mos) won't go hungry. He didn't grow at all in weight from 10 to 14 months but continued to top the charts for height and head circumference.

Frankly, other than offering a nibble tray for grazing and respecting his requests when he'd like to leave the table, I don't know that any of my actions have had an appreciable impact on his eating. We prioritize proteins and produce in our home, and I'm mindful to select more calorie dense options for DS wherever possible.

I suspect the root of my son's-- and others' childrens'-- limited eating is their constant interest in doing EVERYTHING.

What is to give light must endure burning.