In young children, cannabis ingestion resulting in coma is very rare. Only nine cases have been reported in the literature and most have occurred in inquisitive toddlers. We review the cases to date and report the youngest recorded case of coma due to cannabis ingestion in an 11-month-old girl. This case highlights the importance of considering toxicological causes and the parental recreational drug history in young children who present with an altered level of consciousness. Child protection considerations are also discussed.