Hi,
Oscar is still funny about where milk comes from. I have used Avent for EBM since he was born and then used their soft sippy tops for water from around 8 mths. At this stagr we were more or less back to exclusive milk feeds from the breast (as he didn't need milk while I was in work) apart from the EBM (from work) DF in bottle....
when I stopped BF at 16 mths we gave toddler formula in bottle (as it's sweeter than cows milk and he rfused cows milk completely)....he then decided he would drink cows milk ice cold from fridge thro a straw after his tea(never from sippy even today) and toddler formula (in the am only) from the avent sippy...BUT the sippy top (green hard Avent one) has to be attached to clear plastic Avent bottle and not the coloured magic cups which for him as his water cups.....so my child, being typically ritualistic at 2, after many cups and straws, now has a milk feeding routine again and has about 240 mls twice a day....once low fat cows milk and once toddler formula!