You should continue with the NAN HA until your son is at least 18 months old.At that stage he should first have a test for cow's milk allergy done which is called the RAST test. His paediatrician can have this test done. If this test is negative he will be able to have ordianary full cream cows milk from then on. His milk requirements will go down from now on. He does not need more than 600ml to 700ml a day now. By 2 years he will need only 2 cups a day.
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