Sadly I think there's just not the general knowledge of them out there - possibly well stamped-out over the previous few decades of high FF use, parents advised to leave babies to cry so they withdraw sleep through, that sort of thing?
I have a personal campaign to raise awareness with local mums about the big 4 mth GS - we have a HV who routinely recommends weaning at 4mths so I use the line that the 4mth GS 'was traditionally misinterpreted as a need to wean'.