I thought I had a 9 month size. Turns out it's a 6-9 month size, which is slightly smaller, so it's a good thing I tried it on him today for church so he can wear it a couple times before it gets too small. Liam only turned 6 months a couple of days ago but already he is too big for most of his 6 month clothes. I think he had a sudden spurt right after Christmas.
The picture was taken on the changing mat, right before I had to change him out of his beautiful pooped-on slacks and undershirt.