welcome to HCM
I would like to inform you that confirmed case of typhoid
needs 14 days of treatment and in this case your baby did not completed his treatment. And another things is that Widal test
is not always good for typhoid diagnosis and widal test result depends on duration of fever
.The treatment(oral or i.m medicine) depends on the clinical condition of your baby.
You should reconsult your doctor.
Another thing is that it is a water born disease and always drink safe water.