Had my friend's little girl try this on. She is 5 and 1/2. It fit perfectly!
I had to post this dress only because I've never had a sizing issue so extreme. It is a child size 1 intended for my baby to wear this coming summer, but it is gigantic!! There is no way it fits any one year old on the planet. I'm a little annoyed because it is so off the chart, but what can you do? This is sewing sometimes. I have enough experience to notice it looked awfully large when I cut it out, but you just don't really know until you put it all together.
Here is a 2+ year old giving it a try......
She's pretty much swimming in the one year old dress.
and here's an 8 year old wearing the dress. (You can't tell in this picture, but the bodice is way too tight around her chest.)
At least in these you can catch the vision of how cute it will be when it's on the right age girl. It's such a cute and very easy pattern, but just beware of this sizing issue if you decide to give it a go. My favorite part is how full the dress is. Pretty!