Almost 3mos baby not drinking enough milk

Hi expert mummies, My baby weight now is 4.9kg and her milk consumption is about 550-650ml a day. Every 3-4 hrs she can only finish about 60-90ml. Should I be worry? I already went to see Dr to ask about it but Dr said she’s healthy and gaining weight. My baby is formula fed since birth. I can only pump 30-40ml of breast milk a day (not enough breast milk) Another unique behaviour of my baby is when we try to put her to the cot she will start to wake up. She preferred to be carried/held. During day time her sleep is interrupted cos of this. Luckily her night time sleeps a stretch of 5-6hrs. My problem only is day time. She’s heavy and cannot always carry her while she sleeps.