The labourer Rampravesh and his pregnant wife Meera, residents of Peepli village, were brutally beaten up last night, which led to the victim suffering a miscarriage, SP Jagdish Sharma said.
The woman and her minor child were rushed to a local hospital, where they declared the toddler dead.
The accused identified as Mahipal, along with his nephew and an accountant were named in a complaint filed by the victims yesterday, they said, adding, no arrests have been made so far.
As the matter heated up, the brick kiln owner allegedly hit Meera in her stomach and when her 2-year-old son Suraj came near her, they slammed him on the floor, which led to his death.
The minor's body has been sent for post mortem, they said.