Talk to Pediatrician on Baby Not Taking Feed

my daughter is 3 month old she is on breast feed n at night i give her only 1 bottle. its been she is not taking feed properly she doesn't take breast or bottle when she is wakeup when she sleeps then i feed her but she doesn't take it untill she is awake she poops 3 times. i took her to pead she doesn't have any throat n ear infection. is that normal if she is doing it? n her weight is 5 kg her birth weight was 2.8kg