Hi, I'm having trouble getting my 16 week old daughter to take her bottle in one go. I exclusively breast fed for 12 weeks and it has been a real struggle getting her onto the bottle. (I have found MAM bottles/teats the best). Some times she just takes a few ounces from the bottle then refuses to take any more until later. How long can I keep trying the same bottle? (I have been discarding after an hour and it is costing me a fortune in wasted formula). She was a 'snacker' on the breast which is why moved to bottles. Should I just wait until exactly 4 hrs between feeds so I know she is really hungry and will definitely take it in a one-er?