My 5 and half month old daughter has started waking up every 45 minutes to 1 hour at night. She then takes few sips of bm & goes back to sleep. Her day time naps are also of around 45 mins. She is fussy and crying throughout the day and drinks bm every hour for just 5-7 mins. Is it that she's not getting enough feed? Can I start top feed and other liquids?