My son was in 6 month clothes at the time of his baptism, so I thought a 6-12 month outfit would work.  It worked, but wasn't as comfortable as I had hoped.  The leg cuffs do not have elastic, and were very tight so that they left marks and almost cut off his circulation, so if you do get this, make sure you get at least a size up from what you ordered if your son has any chub on his legs at all (hopefully it would help).  And even if it weren't for the legs being tight, it was very snug for him to fit into.

Now, the outfit was very cute and my son looked adorable.  And was cotton (which I was looking for), so was lighter than they satin alternatives.  But I do recommend white diaper and and/or a white onsie under underneath as it is very see-through.