help! my daughter is 5 weeks old. an shes been taking 4 oz every 3 hours for the past 2 weeks.. but now in the past few…

help! my daughter is 5 weeks old. an shes been taking 4 oz every 3 hours for the past 2 weeks.. but now in the past few days she's been eating less an taking a lot longer to eat.... she drinks maybe 2 oz to 3 oz every 3 hours. she doesn't seems fussy or hungry after she burps an everything... is this normal??