Crochet Baby Mermaid Tail and Fins for Photo Props
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This crochet baby mermaid tail is a tapered photo-prop piece with a scalloped waist and two separate flipper fins at the narrow end. The source also contains accessory options, but this article concentrates on the tail and fin construction. It is intended for a brief supervised photo setup, with the original garment proportions checked against the baby.

Project details
| Skill level | Intermediate |
|---|---|
| Size | Source 0–3 months; tail approximately 14 inches before fins. |
| Hook | US I for the source tail; US J/K for its larger fins. |
| Source | Mermaid Costume, supplied Mermaid Outfit Baby.pdf; tail and fin components selected. |
Materials and gauge
Medium/worsted yarn, source hook sizes, needle, ruler, markers and scissors. Source gauge: four dc and two dc rows per inch. The yarn/hook combination must be sampled for fit.
Start from the narrow tail tip
Use US dc and joined rounds. Make a magic ring with six dc and close it. The source uses chain 2 to begin subsequent rounds and joins at the beginning; mark the actual first dc so the starting chain is not accidentally added to every count.
| Rounds | Source dc totals |
|---|---|
| 1–6 | 6, 9, 12, 16, 16, 20 |
| 7–12 | 20, 24, 24, 24, 28, 28 |
| 13–18 | 35, 35, 40, 40, 48, 48 |
| 19–23 | 56 each round |
| 24–27 | 52, 48, 44, 44 |
These increases are deliberately uneven in frequency, gradually widening the lower tail before narrowing the waist. Check the source’s increase group for each transition; do not apply one six-increase rule throughout the piece.
Finish the waist edge
The scalloped edge uses five-dc shells separated by skipped stitches and slip-stitch anchors. Use chain 3 as part of the first shell as directed in the source. Keep the edge relaxed and verify that the opening is suitable before adding any gathering cord.
The source suggests a longer variation by repeating a middle section, but length and waist fit should be checked independently. A yarn change can alter both. This article follows the source’s 0–3 month tail rather than mixing its extension option into the count table.

Make two matching fins
Each fin begins with chain 28. Work twenty-seven hdc from the second chain. The source line refers to more remaining chains than exist; twenty-seven is the workable total from this foundation. Continue in front loops only, shaping with skipped or unworked stitches.
The source row totals progress 26, 25, 23, 22, 21, 18, then a row of fourteen hdc plus two slip stitches, followed by fourteen hdc after skipping those slip stitches. Keep the same sequence on both fins. The angled side and longer straight edge should match when the two pieces are mirrored.
Add the shell edging along the long straight side. The source allows four or five shells depending on tension; the important check is that the two fins have the same number. Do not force a different shell count on each side just to consume all edge stitches.
Gather and attach the flipper
Place the two fins together, reversing one so their outlines mirror. Sew the center join, then pass a gathering strand across the upper fin edge. Pull gently and pin the gathered section around the bottom point of the tail, starting about four or five rounds above the tip as pictured.
Check the front and back before sewing the gathered flipper completely. Leave the gathering tails until every attachment is secure, then weave them inside. Optional chain-loop scales can be added below the waist edge without changing the main tail counts.

Keep the source variations separate
The file includes headband and top options and notes that some shell-accessory photos show an older version. Do not assume those photos verify the final accessory instructions. The tail and fin components described here form the selected project.
Use this restrictive photo accessory only while an adult is actively supervising. Keep any optional ties away from the neck and remove the outfit after the session; it is not a sleep garment.
Frequently asked questions
Which parts of the source are covered?
The tapered tail, waist edge and two fins. Other costume accessories remain in the original reference.
How many hdc follow chain 28?
Twenty-seven when beginning in the second chain. The source’s larger written chain reference is a typo.
Must the fins have exactly five shells?
The source allows four or five depending on tension, but both fins should match.
Pattern and photograph credits
Mermaid Costume, supplied Mermaid Outfit Baby.pdf; tail and fin components selected. Photographs show the supplied source projects. Crops, rotated photographs and editorial checklists are identified in their captions. Any stitch-count or terminology clarification is identified in the relevant section.
Open the original Mermaid Outfit Baby.pdf pattern reference in Drive — Whole PDF. Keep the original pages beside this guide for the detailed diagrams and any section specifically referenced above.
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