The sizes on this outfit really do run quite small. We had a wedding to go to and wanted our little guy to look cute. The outfit was on him, a little snug, but our son is in the 95 percentile for height so we are accustomed to things not quite fitting (we typically leave a button or two undone or something). This outfit seemed fine while I had my son laying on his back and all buttoned up. But when I picked him up he started turning red in the face and couldn't breathe. I ripped the clip on bow-tie off immediately and he immediately gasped a huge breath and started crying. Of course I felt awful for forcing the outfit on ... I layed him down to start taking the outfit off when he pealed into another scream... the suspenders had come lose in back and the metal had dug into his skin (even through the shirt). I should have bought the 9 month size for my 3 month old!! I felt aweful and my poor son felt worse.