LO is going to be 5 months on the 4th of Oct. and has suddenly gotten a ravenous appetite....sometimes eating 8+ ounces every 2-3 hours (up dramatically from 5-6 ounces). We haven't been able to get in for her regular checkup (we've been traveling, she's been sick, the appointments are booked, etc.) but we want to start her on some rice cereal so she's satisfied after feeding. Do we really need dr.'s permission?? If not, any suggestions on how to dilute it?