A few more months will not hurt

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The ad said that moms shouldn't carry their children in a sling, they say it will hurt their back, but a mother has to carry a baby in her stumck for 9 months and at first it does hurt your back but wouldn't you get use to it? So would a few more months of having a baby straped to you really afect you that much? I don't think it would, I think that you would ajust to the waight gain just like when you were pregnet with them. I also believe that it is easyer for the mother because the mothers hands are free so they can do other things.