Marijuana impairs growth in mid-gestation foetuses.


Marijuana (Cannabis sativa) is the most commonly used illicit drug by pregnant women, but information is limited about the effects of prenatal cannabis exposure on foetal development. The present study evaluated the influence of early maternal marijuana use on foetal growth.

Women electing voluntary saline-induced abortions were recruited at a mid-gestational stage of pregnancy (weeks 17-22), and detailed drug use and medical histories were obtained. Toxicological assays (maternal urine and foetal meconium) were used in conjunction with the maternal report to assign groups. Subjects with documented cocaine and opiate use were excluded.

Main developmental outcome variables were foetal weight, foot length, body length, and head circumference; ponderal index was also examined. Analyses were adjusted for maternal alcohol and cigarette use. Marijuana (n=44)- and non-marijuana (n=95)-exposed foetuses had similar rates of growth with increased age. However, there was a 0.08-cm (95% CI -0.15 to -0.01) and 14.53-g (95% CI -28.21 to 0.86) significant reduction of foot length and body weight, respectively, for marijuana-exposed foetuses.

Moreover, foetal foot length development was negatively correlated with the amount and frequency of marijuana use reported by the mothers. These findings provide evidence of a negative impact of prenatal marijuana exposure on the mid-gestational foetal growth even when adjusting for maternal use of other substances well known to impair foetal development. PMID: 15734273    DOI: 10.1016/


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