Struggling to keep baby awake to drink bottle


Little one will be 6 weeks tomorrow and we are still struggling to keep her awake to drink 3-4oz at a time. She will be wide awake and then pass out after maybe an ounce. Is anyone else experiencing this? We have to mess with her a ton to get her to drink between 2-4 oz and feeds last foreverrrr. Any insight would be helpful. Thanks!