If your son is taking Duphalac every day it is unusual that he is so constipated. Duphalac is an excellent treatment for children with constipation. You mention that his stomach was so swollen that it was hard. It is possible that your son is severely constipated and he may well require a fleet enema to relieve his constipation. Pegicol is unlikely to help him at this stage. It would be best to ask his paediatrician to see him.
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