I procrastinated on family photo outfits and am in a rush to find something. I found a flannel button up for LO that I love from Gap but haven't ever gotten anything from them and am not sure how the sizes run. LO swims in 12 month stuff and is almost getting too big for 9 months but that's what I would ideally order for him. This shirt is sized 6-12 months, which is a huge range. I don't have time to order this and then find something else if it's too big..

Any advice? Pics are this Sunday!