My doctor suggested a very slow transition and it has been working for us so far. She also suggested first transition to milk and then transition off the bottle - if you do it all at once it could cause a "rebellion". So we did 1 oz at a time and did that amount for 2 days. We are up to 4 oz of milk (with 2 oz of formula) and my daughter hasn't made a peep. Maybe go back to the bottle and start slow! Good luck!