My son is 5 weeks old and I just started using the sling today. I really like it. I think it takes a little practice, but once you figure it out, its pretty neat! Its not painful unless you wore it all day. Let's face it - if there is more than 8 pounds attached to the front of you, you are going to feel it after awhile! My son is sleeping in it right now as I type the review. I went on the website earlier to read the instructions again - very helpful! :-)