The boy had been admitted to the Trivandrum Medical College Hospital here, police said.
The boy's mother, who tried to chase away the dogs, was bitten on her hands and legs.
The incident comes three days after a 65-year-old woman was mauled to death by a pack of dogs at coastal hamlet Pullivilla near here, prompting the state government to announce stern measures, including culling of violent dogs, to check the menace.
"When I tried to push them away I was bitten on the hands and legs," she told television channels.
Meanwhile, incidents of dog bites have been reported from rural areas of the city and Palakkad district.
Eight persons at Palakkad and another at Pullivilla were attacked by street dogs.
Disclaimer: No Business Standard Journalist was involved in creation of this content