I just got a K'tan (the Active one, made of mesh) and according to the package, I'm in-between sizes and should get the smaller size. I purchased a Small. I have it on now, and it feels really tight with my 5 week old in it; I have no idea how an older child would fit in there! It almost feels too tight... but I'm wondering if it's supposed to be like that?

Please advise.. should I pick up a larger size?