I'd wait until he's showing signs that he's interested in food, if he's watching what you're eating as you put something into your mouth etc and hold off for awhile longer til then. He may also have that reflex which pushes the tongue forward and the food out of his mouth if you start earlier than when he's ready, anyway. I held out with our third bub last year, b/c just b.feeding is so much easier (especially if he's a great weight) than having to start solids.