Although there is some evidence of reduced cognitive function in some babies whose mothers used marijuana, I am always impressed how this is always blamed on breastfeeding. After all, if they smoked it during lactation, might they not have done so during pregnancy, when the baby's brain is more sensitive and getting larger doses. This same argument holds for PCB's in breastmilk and the like. The nurse should stop being such a crusader (no one every blames bottle feeding pushers of being crusaders, eh). There is no evidence for what she says. I don't think it will hurt the baby to have a little cannabis, tiny amounts for a bit. The mother should breastfeed!!! Jack Newman, MD, FRCPC PS Going for new record for posts, Chris.