Cannabis is a drug derived from hemp plant, Cannabis sativa, used both as a recreational drug or as medicine. It is a widespread illegal substance, generally smoked for its hallucinogenic properties. Little is known about the adverse effects of postnatal cannabis exposure throw breast feeding because of a lack of studies in lactating women. The active substance of cannabis is the delta 9 Tetrahydrocannabinol (THC). Some studies conclude that it could decrease motor development of the child at one year of age. Therefore, cannabis use and abuse of other drugs like alcohol, tobacco, or cocaine must be contraindicated during breast feeding. Mothers who use cannabis must stop breast feeding, or ask for medical assistance to stop cannabis use in order to provide her baby with all the benefits of human milk.
Garry, A;  Virginie Rigourd, V; Aubry, S;  Amirouche, A; Fauroux, V;  Serreau, R 
- Department dIngenierie Biologique, Ecole Polytechnique de Universite de Nice - Sophia Antipolis, 1645 Route des Lucioles, 06410 Biot (France)
- Lactarium d'Ile de France, Institut de Puericulture et de Perinatalogie, 26 Boulevard Brune, 75014 Paris (France)
- Centre de Recherche Clinique Paris Centre, 89 rue d'Assas, 75006 Paris (France)
- Centre de Recherche Clinique Paris Centre EA 3620, 89 rue d'Assas 75006 Paris (France)