If you have a little one that has a mermaid blanket, you might take a look at these adorable matching doll blankets.
They come in a few colors and would be such a cute gift for a little American Girl fan.
The price on the blanket is $14.99 and you can add $2.99 for shipping.
Please note these are selling out extremely quickly so you want to order right away.
If you do have an American Girl fan at home, you can find 40 cute DIY ideas here.