Hi, many thanks for the query!
You need to do- Stool (Culture & Microscopy), uSG (Abdo-Pelvis), CBC.
Occasional loose stools at this age group is quite possible.
Lots of sugary food is not related.Abdominal pain
is due to excessive spasms of the bowels.
Take Antispasmodics, Antibiotics with your doctor's opinion.
Parasitic infestations are common in this age group, so if it is positive for that, take appropriate anti-helminthics (albendazole/mebendazole
your doctor's opinion.
Drink plenty of water (preferably ORS
Wish you a good health.