From what I've read, the recovery time for babies is quite fast. According to KKH's article (http://www.kkh.com.sg/HealthPedia/Pages/ChildrensSurgeriesHerniasHydrocoele.aspx) on this condition , there is no need to remove the stitches post surgery and the dressing could be taken off one week after the procedure. Accounts from other mothers siggest that no special restriction on activities is needed, babues will naturally restrict their own movements if they experience any discomfort. So I think you can possibly gauge from your baby's activity level to know how long to refrain from carseat and babywearing. Also good to check with your doctor for his recommendations.
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My niece has undergone it when she was younger and she recovered pretty fast. In fact, I didn't even realized she had gone for an operation because she was looking pretty fine
thanks