Nice quality and soft; the slim fit works for our little one (70% for length and 15% for weight).  At 6 months this fits (I don't think it will fit through 9 months because the sleeve holes would get too snug for fat little wrists).  As others have commented, the snap closure does at times gap.  The styling is just so cute - like a little old fashioned union suit.  Cloth diapers fit under it, but it is a little snug.
My only complaint would be that there is a tiny hole near the tag in the back after one washing, but this is possibly our old washer's fault and not the garment.