I follow the tin sort of, I try it yet follow what Elouise wants. Atm, she has 250ml in the morning, food, 250ml at lunch, food, 250ml in the early evening and food. Sometimes she wants more in the morning, so I give her 100ml extra. I keep trying to get her to finish a bottle. Sometimes let her play and then give it to her again. She doesn't always want her food either. Yoghurt, and fruit she'll pretty much always eat. Yes I did throw out a tin when we changed brands, I couldn't give it to a friend as I couldn't remember when I opened it. I think its better to err on the side of caution.