I am not sure if you really meant that your little son can drink 2L of milk in 2 hours or you meant 24 hours. In any case he is drinking too much milk per day.He is already drinking from a sippy cup so he can also drink his milk from a sippy cup as well. He only needs about 600ml of milk per day now.Of course he should also drink water and once a day can have dilute fruit juice.
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