Melissa from Blank Slate Patterns and Melly Sews shares a pattern for making this adorable mermaid sleep sack. The top is a standard sleep sack, sleeveless and with a long zip down the front. What makes it a mermaid is the fun mermaid fin at the bottom! You can get the pattern for free by subscribing to her mailing list, or buy it for a small price. The pattern is sized to fit babies 0-3 months.
Click below for her tutorial:
Sew a Mermaid Sleep Sack for Babies, by Melly Sews
[photo from Melly Sews]