How much baby cereal do you give to a baby to get them to sleep through the night?
You don’t. There is absolutely no reason to believe that giving a baby cereal will make them sleep longer. Five hours of sleep *is* as much as a baby should be expected to give at a stretch, and that’s the absolute *most*. And solid foods should not be given, period, until all developmental signs of solids readiness are present. That includes cereal, and that especially includes cereal in a bottle which presents a choking hazard.