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Instead of using 30 ml water with each scoop, please add 45 ml water to each scoop for making the formula. Also, reduce the consumption of milk and simultaneously increase the consumption of fruits, vegetables, chicken, etc., whatever the child likes. As of now, you can use laxatives as and when required. However, as soon as a week or two after the above diet changes are made, the need for a laxative should be much lesser than what it is now.