Marco Cuevas, 31, and his pregnant wife Sandy, 29, were arrested in California when police allegedly caught them selling drugs from their car.
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After the couple, who have three children, were arrested, their infant son was found in the back seat - alongside 200 grams of cocaine.
Tests soon revealed that the 5-year-old had the Class A drug in his system.
Mr Cuevas was carrying a further two ounces of cocaine while Mrs Cuevas, who is said to be seven months pregnant, had $10,000 cash on her person when they were arrested on Friday, KTLA reported.
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The couple had reportedly been selling drugs to local teenagers.
A search on the family's home in Sylmar uncovered more drugs and weapons, according to the Ventura County Sheriff's office.
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Police found marijuana, pills, $75,000, 16 guns and nearly 3,000 rounds of ammunition in the property.
The five-year-old boy - who did not require medical treatment, despite ingesting the drug - was taken into protective custody, along with the couple's two other children.
Both Mr and Mrs Cuevas are accused of selling and conspiracy to sell cocaine and child endangerment.
He is being held in custody on $1 million bail, while she has been released on bail.