Change of poop and eating habits


My LO has been eating 4 oz every three hours well yesterday she ate normal till about 1 then she only wanted 3 oz and then her next feeding she only ate 2 oz. she has been sleeping a lot yesterday but still a happy baby and not crying. She pooped right before bed and it was a whole different color then normal.... usually her poop is hunter green and this was yellow and smelled horrible! She ate 4 oz before bed and slept for 8 hours ate 4 oz and then slept for 4 tried to feed her again she only ate 2 oz and she pooped again pale yellow and smelled horrible. She did have a full week of daycare which she has not done yet so maybe she is exhausted..... should i call her pediatrician?