The drug was discovered in the boy's blood after social workers were called by police to take the child into their care.

BABY LEFT BRAIN DEAD AFTER PARENTS INJECT HIM WITH CRYSTAL METH

Police had found the "unusually sleepy child", alongside 60 grams of dried cannabis ready for sale, and 3kg of green cannabis, after raiding the home of the boy's parents, Diana Curelaru, 25, and her husband Bogdan, 30, in the city of Satu Mare in north-western Romania.

A blood test revealed cannabis in the child's blood that had apparently been passed on from its mother.

Police spokesman Radu Ionescu said: "The couple were taken into custody and interrogated.

"They had set up a drug trafficking network together with three other people where they sold one gram packets of cannabis for 50 lei (£10) in and around Satu Mare.

"The couple were heavy users themselves and funded their lifestyle by growing the cannabis on the roof."

DEBATE: SHOULD PREGNANT DRUG ADDICTS BE PROSECUTED?

GIRL RAPED AFTER BEING USED AS 'BAIT' FOR RAPIST BY SCHOOL

Satu Mare Child Care manager, Eugenia Ardelean, said: "The mother thought that smoking cannabis was harmless and had no idea it was being passed on to the child through her milk.

"She did say that the baby had seemed unusually placid and slept most of the time, often needing to be woken to feed it."

The boy is now being cared for by his grandmother.