I had not heard that. I did hear that at around 18 months thier digestive enzymes are at levels comparable to an adults.<br>
There is a belief, though, that the first teeth are one of the signals that baby is ready to start solids, along with sitting unassisted and losing thier gag reflex.
I agree that for most babies the time until they have all the digestive jucies to digest everything, is much later then when their first teeth come in, more like when thier first or second molars come in.<br><br><br>
There is a thread with links to reasons to wait for solids and it a couple of the articles talk about digestive system readyness--<a href="http://www.mothering.com/discussions/showthread.php?t=270622&highlight=digestive" target="_blank">Here it is</a>-- go down to my posts especially the second one with links.