You should do your research before you start flaming others (BTW, which is against the forum rules). The link I'd provided before this post oughta give you a good start.

Doing anything not healthy for your body while pregnant is gonna affect the baby, from not eating right food to doing drugs its just wrong
Why would cannabis, being non-toxic and not harmful to adults is suddenly harmful to developing babies? You have fallen into the trap of the Prohibitionists who cry "ITS FOR THE CHILDREN" .

Education. Such a great thing.