My 10 month old nurses 4 to 5 xday (2 to 3 times well but quick and the other 1 to 2 times just for a sip). How do I determine if she is getting enough breastmilk versus water/juice throughout the day? Should I be concerned and give some formula? At what point do I need to give expressed milk or formula to make sure she's getting the proper nutrirtion. She is a very good solid food eater.