7 week old

Hey all. My 7 week old is formula fed and is eating4 1/2 ounces each feeding (every two hours on the dot) during the day. His nighttime hours stretch a whopping 5-7 hours. His pediatrician suggested maybe placing a little rice cereal in his bottle during the day to make him stretch just a wee bit more. As a first time mom i immediately researched and have seen multiple negative reviews and thoughts on putting rice cereal in bottles. Should i stick to what we’re doing now, or try the cereal. I’m lost, and any input is appreciated!