Yes, there is a new law coming into effect in April, see
http://www.cic.gc.ca/english/citizenship/rules-citizenship.asp but from what it says on there, it only applies to children born after the new law takes effect.
Also it will only apply when the parent has inherited citizenship, not if they were naturalized. OP doesn't say which she is. In any case, her son will get citizenship since he's already born before the new law.