THIS WAS PERFECT!!! This little romper was exactly what I was looking for for my daughter's (almost) 6 month pictures. She is like 5.5 months old, and she is a little above average in terms of height and weight (maybe around 75th percentile).
Bought the M size. It was a perfect fit! She probably won't be able to wear it again, but it's not really an every day kind of outfit anyway. The color is a cream/ivory color. It is just so adorable; I highly recommend it!