The average weight for a boy of 18 months is 11.6kg. Your young son's weight is obviously well above this average.Why did you change him to a soya milk instead of a cow's milk based formula? If he is not allergic to cow's milk and is not lactose intolerant then he should be on a growth formula such as Nido.This will help to make him feel more satisfied after his bedtime bottle.Your son does not need more than 600ml of milk per day now.
Hopefully he will be happier on a more filling formula and won't wake up in the early morning for food. You need to be firm with him about this extra meal as it has become a habit that may be hard to break. You will probably have to use the 'controlled crying method' when he wakes at 2 in the morning. This can be hard on the nerves but will work if you keep at it. Read about this method on Google.
Do not worry about your son still wanting to drink from a bottle in the evening. He is mostly using a sippy cup and should give up wanting to drink from a bottle over the next few months by himself.
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