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i am not totally sure what was 20 yrs ago - perhaps it depends of the certain place? but here they were nor popular neither wide-spread (10 years ago already at least well-known, recognized, adn well-accepted). but earlier on... women wearing their babies in slings, often were considered/treated as sort of poor wretched Gypsies... 'whose babies suffer from unability to have normal life' -- enough to chew on, right? attitude was changing... and happily, have changed -- not in one day.

I think a great Aunt made a couple for us that got good use by me for all four of my girls, a couple had Colic and putting them in one and walking around the block was often the only thing to settle them down even if only while walking, I did get some odd looks using them back in NZ, in the cities but not so much in more Rural areas, and in Singapore they were a lot more common