Thank you for your query,
I advise you to send stool for culture and sensitivity to know the growth of any pathogenic bacteria and its sensitivity to the antibiotic so that appropriate antibiotic can be selected from the list.
If oral antibiotic is sensitive it can be started to avoid injections.
If given in appropriate and correct dose and duration, amikacin
is not associated with kidney
problems in normal children with normal kidney function.
Consult your Pediatrician
again and discuss your concerns.
Hope I have answered your query.