2 month old eating different

Joanna
Is it normal that my 2 month old is acting like she's hungry but she doesn't take the bottle right all of a sudden it takes me a long time to feed her which I don't mind I have patience but I'm worried for her. She eats 4oz every 3 hours and now she gets hungry before the 3 hours or shows signs like she's hungry and when I give her the bottle she doesn't chug it down I have to pretend like I'm gonna take it away and then she sucks finally and that's how the entire feeding goes..( she drinks nutrimigen formula) and then last feeding again she got hungry 10-20 minutes before the 3 hours and she only drank 2 oz and fell asleep and she's still sleeping ... (that was at 7-8 pm) I'm really worried please help