Baby not eating more then 1oz a go

My baby girl is 3 months old and all day has just wanted to sleep. When she’s not sleeping she’s crying. Every bottle I have given her she will not eat more then an ounce. She normally drinks 3-4 ounces every time she has a bottle. She has had wet nappies and doesn’t have a temperature. She releases wind fine. So I don’t think it’s colic. Any ideas mommas? Hoping she goes back to her normal self tomorrow if not is it worth taking her to the doctor?