When the baby was about 5 days old (no joke) I started off with the Croquet Dress by Oliver + S. I really can't say enough about how much I love these patterns. They sew up beautifully, the details are stunning, yet they are simplistic with a bit of modern flair.
I purchased the fabric for these a few years ago, it's from the Tutti Frutti line that Joann's carries. Not my favorite fabric wise, as it is rather stiff and waffely (is that even a word?) but I thought the colors looked cute together. I made a 4T and 2T.
I will definitely pull this pattern out again next summer. The dresses were a nice, quick project and they are roomy enough so I think the 4T will work again for Miss L next season.