Not unexpected yet ever so sad: Baby signing is taking an ever more commercial direction with all sorts of commercial crap coming out. The initial research underlying the whole phenomenon was weak to start with. Now it’s been misrepresented so much that it’s becoming just a load of crap.
This ‘baby’ can now nag you about an ice cream in two languages (source)
I see for example the stuff from signing4babies (clicking this link will not earn me anything) popping up in the AdSense ads in the sidebar. I find AdSense an interesting monitor of online commercial activities related to my topics, but do not recommend the sites per se. Signing4babies is under scrutiny but appears not to be doing anything wrong. But the claims about signing babies they make, such as a boost in IQ, are ridiculous and not validated in the sense of cause-and-effect by the research at all.