Thanks for placing your query here.
I can appreciate your concerns.
Yes you are right in suspecting malabsorption
as a cause of such stools.
Please get his total & direct bilirubin
If the bilirubin is mainly indirect --no serios concerns .
If the direct bilirubin is raised --there is every reason to be concerned & further detailed investigations are needed.
In short two tests are needed immediately.
1/-stool analysis esp for fat globules.
2/-total & differential bilirubin.
Further course of action will depend upon the results.
Hope I have answered your query.
If you have any further questions I will be happy to help.
Wish you son good health.