I understand that blue milk is a normal cow's milk? If I am right the guidelines are 12oz for formula over 12mo or around 15-18oz of cow's milk. In terms of timing - it'f good to decide which feed is the most important for you. I would probably mid-morning feed and change it to a small snack. Afternoon milk could be changed to a beaker rigjt away and also accompanied by a small snack. After 2-3 weeks I would change morning or evening bottle for a beaker, and finally go for the last bottle. I changed morning milk to a beaker and started offering solid breakfast with a sip of milk, than snack, lunch, snack, dinner and I kept evening milk feed for a long spell until DS started to refuse it.