Baby cereal time

Jennifer

So my MIL watch my 5 month old baby during the week and he eats every 3 hours 6 ounces from bottles and idk how much from Breastfeeding I cant get him to go longer maybe an extra half hour longer from BF but anyway today his bottle was at 730am and his ideal next feeding is 1030 . My. MiL gave him cearel at 10 because he was suppose to get cerael in the morning but he took a nap instead and then she gave him his bottle at 12. So he goes 4 1/2 hours between bottles because of the cerael. I've been going back and forth and telling her he can skip cerael if he naps instead or give it to him half hour after a bottle and not 30 minutes before his bottle , it's not his main food source .

What's your opinion on when to have cereal.