It is washable and my guess would be that it would hold up to about 15 pounds. It was my daughter's and I have never used one. I am sorry that I do not know exactly, but the tags do not give specifications. Thanks for your interest!
http://www.amazon.com/Munchkin-Carrier-Blueberry-Lollipop-medium/dp/B005HGCEX8%3FSubscriptionId%3D099W0TADMGQY7JWQJM82%26tag%3Dtelevisionsco-20%26linkCode%3Dxm2%26camp%3D2025%26creative%3D165953%26creativeASIN%3DB005HGCEX8 see this ad--I am selling for my daughter--this is the exact sling that is sold on Amazon. I would say that it is for a newborn to 3-6 months.