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They were given small amounts of radiolabeled THC infants monkeys receiving oral regularly 2 mg of THC per kilo of weight between 2 and 5 times a week. During the observation period of 24 hours, approximately 0.2% of the labeled THC appeared in the breast milk.
The present study investigated the relationship between infant exposure to marijuana through breast milk and motor and mental development at one year. 136 infants were selected and controlled until they were one year. 68 were exposed to marijuana present in breast milk, and were compared with another 68 in turn exposed to alcohol and snuff during pregnancy.
Marijuana exposure maternally during the first month after birth was associated with a decrease in motor development (movements) at the age of one year. There was no association between exposure in the third month and motor development. There was also no relationship between children’s mental development and exposure to marijuana or the first month or the third.
The result should be interpreted with caution due to the nature of the study. You cannot infer from these results that marijuana exposure during lactation impairs infant motor development at the age of one year. Exposure to marijuana lactation appeared to impair motor development, but this does not mean that there is a cause-effect relationship. Exposure to marijuana during pregnancy, passive inhalation of it in the air and interactions between mother and child are three factors that can act as input confounding factors in the associations observed in this study.
Small amounts of THC pass into the milk of cannabis using mothers. In a study in monkeys who chronically received THC in breast milk it appeared 0.2% of the same. Therefore, daily consumption of 50 mg of THC (eg, one gram of marijuana with a THC content of 5%) would result in daily 0.1 mg THC in breast milk.
Chronic use of THC by the mother leads to an accumulation in the milk and may reach higher concentrations in the blood. In one study, the amount of THC in the milk was 8.4 times higher than in blood. Considering figures higher concentrations, i.e. 10 ng / ml (Nano grams per milliliter) THC in blood and 100 ng / ml in milk, would result in the amount of 0.07 mg of THC per 700 ml of milk. 700 ml is what normally eat a baby at each feeding.
Moreover, two studies were conducted to investigate the effects on child development of cannabis use in nursing mothers. One found no effect, the other found slight effects on motor development , if cannabis was more than 15 times during the first month after birth.
The amount of THC found in breast milk of cannabis users is low despite its accumulation by continued use. Only heavy cannabis use will result in amounts that may be relevant to the infant. It is likely that occasional use or under should not effect.