Baby Not Eating, Why??

My bottle fed eight week old has suddenly decreased her milk intake and I’m at a loss trying to figure out why.

She just got out of a leap, but normally takes 4 oz every 3 hours, and sleeps from 10pm-6am. Even her morning bottle she’s only consuming 2 oz now. It’s mid afternoon and she’s had three feeds since waking for the day and won’t eat more than 2oz. She’s been doing this for about 5 days the last week and only consumes 2 bottles at her normal 4oz.

She isn’t crying between feeds as though she is hungry and otherwise appears happy and smiling. She is pooping regular and spit up is minimal, so I don’t think her stomach is full. She does appear to get fussy when we try to keep feeding her beyond the 2 oz. I’m worried that she’s going to become dehydrated. She had her two month appointment two days ago and is otherwise healthy. Gaining weight and growing perfectly, no underlying conditions. She did get vaccinations however.