Authorities said six drones hit a residential area just before dawn, injuring nine other people.
The child, grandson of the local firefighter chief, died alongside his mother, police officer Daryna Shyda, and his grandmother.
Ukrainian President Volodymyr Zelensky said the fire chief arrived to intervene after the attack, to discover that his own house had been destroyed.
In addition, 17 people were injured in Kharkiv, including children and a 93 -year -old person, while drone attacks also affected medical and educational sites in the Odessa region.