The accident took place last night on the National Highway-52's bypass when the family was returning after attending a marriage in Bundi district's Shivpuri village, they said.
The deceased have been identified as Dinesh Keer (25), his wife Seemabai (22) and his mother Panabai (45), all residents of Aarampura village, a police officer said.
"The eight-month-old baby, Swaraj, who was sitting on his mother Seemabai's lap, escaped unhurt," he said.
The officer said that Keer and his mother died on the spot, while Seemabai died while she was being taken to a hospital.
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