Marijuanas most important ingredient was discovered in a small breast-feeding study of nursing mothers, which is based on evidence that more US women use a pot during and after pregnancy.
Experts say the ingredient THC has chemical properties This could cause it to disrupt brain development and potentially cause harm, though solid evidence is lacking.
The new study involved 50 breastfeeding mothers who provided jars and milk samples to researchers at the University of California at San Diego. Laboratory tests found small amounts of THC, the psychoactive chemical that causes marijuana "high," in 34 out of 54 samples up to six days after deployment. Another form of THC and cannabidiol, a pot chemical praised by some as a health-promoting substance, was detected in five samples.
The authors of the study said, "It's reasonable to speculate" that exposure of infants to THC or cannabidiol could "affect normal brain development," depending on the dose and the timing.
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The results reflect results in case reports from years ago when Pot was less potent than what is available today, said co-researcher Christina Chambers, Professor of Paediatrics. It is not known if the observed levels are a risk, but she says her research team is investigating children whose mothers have tried to answer that question.
Two small studies from the 1980s had conflicting results on whether or not the use of kippers is breastfed infants. There was no evidence of growth delays; the others found mild developmental delays in breastfed infants, but their mothers had used a pot during pregnancy.
Most pediatricians promote breastfeeding and their health benefits for infants, but "they are in a dilemma" with babies whose mothers take a pot (19659005) A new American Academy of Pediatrics recommends against pot-use while pregnancy or breastfeeding recognizes this challenge.
"We still support breastfeeding women, even if they use marijuana, but would encourage them to cut and cancel." said Dr. Seth Ammerman, a co-author of the report and professor of pediatrics at Stanford University.
"When advising patients it is important not to judge but to educate patients about the potential risks and benefits," said Ammerman. a healthy result for yourself and your baby.
The study and report were published Monday in the journal Pediatrics.
The American College of Obstetricians and Gynecol ogologen has similar advice.
The academic report says that his advice is based on theoretical risks for itself however, it recognizes contradictory evidence and a lack of research Some studies have linked the use of potency during pregnancy to lower birth weights or premature birth, developmental delays and learning difficulties in older children, but additional factors that prohibit the use of others Including drugs during pregnancy by women complicate the results, the report says.
Marijuana is legal for recreational use in nine states and Washington, DC and for medical use in 31 states, according to the National Conference of State Legislatures  As more states legalize marijuana, its use along with the "false impression" is mounting that it's safe, says the Academy's report. Ammerman said that caution makes sense given the uncertainties.
According to the US government, about 1 in 20 women use marijuana during pregnancy. Estimates for use in nursing mothers vary, but a study in Colorado, where recreational marijuana is legal, put the figure at nearly 20 percent among women in a state supplemental food program.
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The review, the study, and an editorial of the journal all said more research is needed.
Last year, a federal advisory panel said that the lack of scientific information on marijuana poses a risk to public health
This has stigmatized and darkened doctors' views, Keira Sumimoto said. A mother from Irvine, California who used marijuana for medical reasons during pregnancy and lactation. She said that smoking a joint every day helped her gain weight when she was ill, before she learned she was pregnant, and eased birth pains, but she stopped because of counter-reactions from marijuana opponents.
She said her daughter, now 8 months old, is healthy and advanced for her age.
Sumimoto runs @cannabisandmotherhood, an Instagram account that she claims to present truthful information about marijuana so that women can make their own decisions.
She said she agrees with the council to be cautious, but that the Academy's attitude is "just a bit too much."
"The fear takes over and the need and want to understand this plant is ignored by the stigma," said Sumimoto.