netherland pregnancy pregnancy study

Study: Marijuana Use During Pregnancy May Stunt Fetal Growth

Health experts have known about the danger of cigarettes on fetal growth, but marijuana has been difficult to study. A new study, however, may show that pregnant women who smoke marijuana have smaller infants than cigarette smokers.

Researchers in the Netherlands followed 7,500 women during their pregnancies. About 3 percent of the women admitted to smoking marijuana some time during their pregnancies. The infants born to these mothers tended to be smaller and have smaller heads than the other infants. Researchers believe this is contributed to the marijuana.

The women who reported using marijuana also smoked tobacco cigarettes, yet the amount of stunted growth was more than just tobacco is known to do. Also, the more frequently a woman smoked the more her infant was stunted. Experts feel this is contributed to both the lack of oxygen from the smoking as well as a byproduct stunting normal development. The researchers at Erasmus University Medical Center in Rotterdam warn that smoking marijuana during pregnancy has more significant effects than tobacco and that women should quit smoking before becoming pregnant.

Studying the fetal growth by ultrasound, researchers found that women who smoked marijuana early in their pregnancies had infants who were an average of 11 grams, or .38 ounces, smaller per week than average. Mothers who continued smoking marijuana during their pregnancies had infants who were 14 grams, or .49 ounces, smaller per week. Mothers who smoked only tobacco cigarettes had infants 4 grams, or .14 ounces, smaller per week of growth.

Of the 7,500 women who participated, 214 women admitted to using marijuana before and during early pregnancy. Only 81 women admitted to continuing use during later pregnancy. All of the women in the study were monitored through ultrasounds during each of their trimesters. The women were questioned on alcohol, tobacco, and drug use.

Though the numbers of studies are small, researchers feel this is enough to prove the dangers of marijuana during pregnancy. Studies of this nature are often difficult to do because few women will admit to marijuana use during their pregnancies. – Summer, Staff Writer

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PHOTOCREDIT:Gary Boisvert –

About the author


Summer is a mom of three, living life in the slow lane along historic Route 66. She writes, homeschools, gardens, and is still trying to learn how to knit.

1 Comment

  • Considering that THC cures cancer and is the most medicinal oil on the planet, if the study’s are true, it would be from smoking and the byproducts of combustion then the active chemical in the plant.
    I’m sure smoking anything during pregnancy would stunt growth of the fetus.

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