I used mine constantly till DS was about 5 and a half months old, but continued to carry him in my Ergo till, well, we still do and he's 13 and a half months.
If I weren't out and about all the time (as in, in and out of the car constantly between fire brigade, horses, shops, etc) I would still be using the HAB.
I think the reason people can do it for so long is that they are using slings mostly, and hardly using prams. This way your body gains strength as the baby grows, like resistance training! It's in the regular use that you get the most value out of carriers and slings Not to say you don't get value from using one occasionally, but yeah, it will hit you like a brick if you're not used to carrying your child, and work muscles that usually don't work.
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