DS has to be up about an hour, before he eats much of anything. Has been that way pretty much since newborn.
Breakfast M-F is milk in sippy, cereal (either dry, or w/milk, or oatmeal/porridge) and fruit. LOVES fruit for breakfast. Occasionally peanut butter on toast or bagel. Occasionally, fruit & yogurt. Rarely, eggs. (Only seems to like them if I mix in chunks of broccoli & onion, and lots of cheese.) On weekends, likes pancakes or M-F stuff, but will eat what we're having (omelets or such) if we go out for breakfast. Apparently, diner/restaurant food tastes better.
TBH, I never feel like eating until I'm up at least a couple hours... regardless of how long since I last ate.