The Merced County Sheriff's Office said the boy's mother, father and uncle were taken against their will at gunpoint from a business in the city of Merced on Monday.
Sheriff Vern Warnke said the kidnapper has not asked for ransom or contact of any kind.
“We have no motivation behind this. We just know they're gone," Warnke said in a report posted on the department's Facebook page.
Agents are searching Merced and surrounding areas for the infant, Aroohi Dheri; the boy's mother, Jasleen Kaur, 27; Father Jasdeep Singh, 36; and uncle Amandeep Singh, 39.
The sheriff's department released two still images of the images surveillance of a possible suspect and asked for the public's help in identifying the man. He is seen wearing a dark hoodie, dark shorts, and a light blue disposable face mask.
The sheriff said detectives believe the suspect destroyed unspecified evidence in an attempt to cover his tracks.
Merced is a city of 86,000 people about 125 miles (200 kilometers) southwest of San Francisco in the San Joaquin Valley.
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