Her constipation could be due to the NAN HA but she is obviously on an HA formula due to a relatively mild cow's milk allergy. Changing to a soya formula at her age may be a bit difficult but would probably help a lot with her costipation.
If you decide to use the Duphalac which is a very safe preparation for infants, use it for a 10 day period then stop and see if she maintains regular soft stools.If not let me know and I will advise you further.
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