Akayeed, 2, son of Enamul Haque of Gangnia village in Sadar upazila, met the watery burial in a pond near their house in the afternoon, said Additional Superintendent of Police Tariqul Islam.
Waz Kuruni, 5, son of Atar Ali of Kukila village in the upazila, fell into a pond and drowned, he said.
Four-year-old boy Nasim Sheikh, son of Halim Sheikh of Sachilapur village in Sreepur upazila, met the tragic end of his life when he fell into a pond near their house.
In another incident in the upazila, Taslima, 2, daughter of Sohag Mollah of Mangondanga village, fell into a canal, leaving her dead on the spot.
Separate unnatural deaths cases were lodged over the drowning incidents.