Crochet Mermaid Tail Pattern for Baby

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Looking for a fun and adorable way to dress up your little one? This free Crochet Mermaid Tail pattern for babies is the perfect choice!

This charming pattern features a whimsical mermaid tail design that’s sure to make a splash.

The pattern is easy to follow, making it a great project for crocheters of all levels, and is written specifically for baby sizes.

Whether you’re looking to create a fun photo prop or a cozy blanket for your little one to snuggle up in, this mermaid tail pattern is the perfect choice.

You can customize it with your own choice of colors and yarns to create a truly unique and personalized look.

And don’t worry if you’re new to crochet – this pattern includes detailed instructions and helpful tips to guide you through each step of the process.

You’ll be a crochet pro in no time!

So grab your crochet hook and dive into the world of mermaids with this free crochet mermaid tail pattern.

Your little one is sure to love this adorable and cozy accessory!

Crochet Mermaid Tail Pattern Information

crochet mermaid tail

Skill Level

Advanced Beginner. Projects may include simple stitch patterns, color work, and/or shaping.

Project Materials

Crochet Mermaid Tail Size Chart

SizeChestWaistHips
0-3 Months16 inches18 inches19 inches
3-6 Months17 inches19 inches20 inches
Baby Mermaid Tail Size Chart
crochet mermaid tail

Crochet Gauge

12 tc stitches = 4 inches & 6 rows = 4 inches

Important Notes

  • This pattern is written for two lengths: waist length and chest length.
  • This pattern starts with a magic circle.
  • The beginning of each round starts with a chain. This chain does not count as your first stitch. 
  • At the end of each round, you’ll join your yarn with a slip stitch (sl st) to the first stitch made in that round. 
  • You are crocheting in the round.
  • Mermaid tail is worked from the bottom up to the waist or chest.
  • Instructions between two asterisks (*) should be repeated for the remainder of the round.

Etsy Shop

This pattern is also available as an ad-free PDF pattern in my Etsy Shop.

Related Patterns

You may also like my Starfish Appliqué, Baby Dress, and Baby Witch Costume patterns.

crochet mermaid tail

Terms & Abbreviations

  • ch = chain
  • chs = chains
  • st = stitch
  • sts = stitches
  • rnd = round
  • rnds = rounds
  • tc = treble crochet
  • sc = single crochet
  • dc = double crochet

Save this image to your Pinterest Boards to save the pattern.

crochet mermaid tail

Crochet Mermaid Tail Pattern Instructions

0-3 Months Size Crochet Mermaid Tail

Rnd 1: Magic circle, 12 tc, join with a slip stitch to the first st (12 stitches)

Rnd 2: Ch 3, *2 tc in 3 sts, tc in 3 sts*, join (18 stitches)

Rnd 3: Ch 3, *2 tc in 2 sts, tc in 7 sts*, join (22 stitches)

Rnd 4: Ch 3, *2 tc in 2 sts, tc in 9 sts*, join (26 stitches)

Rnd 5: Ch 3, *2 tc in 2 sts, tc in 11 sts*, join (30 stitches)

Rnd 6: Ch 3, *2 tc in 2 sts, tc in 13 sts*, join (34 stitches)

Rnd 7: Ch 3, *2 tc in 3 sts, tc in 14 sts*, join (40 stitches)

Rnd 8: Ch 3, *2 tc in 3 sts, tc in 17 sts*, join (46 stitches)

Rnd 9: Ch 3, *2 tc in 3 sts, tc in 20 sts*, join (52 stitches)

Continue here for waist length tail

Rnds 10- 20: Ch 3, tc in each st, join (52 stitches)

Rnd 21: Ch 1, sc in each st, join and finish off

Continue here for chest length tail

Rnds 10- 27: Ch 3, tc in each st, join (52 stitches)

Rnd 28: Ch 1, sc in each st, join and finish off

Scroll down for the fin pattern.

crochet mermaid tail

3-6 Months Size Crochet Mermaid Tail

Rnd 1: Magic circle, 12 tc, join with a slip stitch to the first st (12 stitches)

Rnd 2: Ch 3, *2 tc in 3 sts, tc in 3 sts*, join (18 stitches)

Rnd 3: Ch 3, *2 tc in 2 sts, tc in 7 sts*, join (22 stitches)

Rnd 4: Ch 3, *2 tc in 2 sts, tc in 9 sts*, join (26 stitches)

Rnd 5: Ch 3, *2 tc in 2 sts, tc in 11 sts*, join (30 stitches)

Rnd 6: Ch 3, *2 tc in 2 sts, tc in 13 sts*, join (34 stitches)

Rnd 7: Ch 3, *2 tc in 3 sts, tc in 14 sts*, join (40 stitches)

Rnd 8: Ch 3, *2 tc in 3 sts, tc in 17 sts*, join (46 stitches)

Rnd 9: Ch 3, *2 tc in 3 sts, tc in 20 sts*, join (52 stitches)

Rnd 10: Ch 3, *2 tc in 3 sts, tc in 23 sts*, join (58 stitches)

Continue here for waist length tail

Rnds 11- 23: Ch 3, tc in each st, join (58 stitches)

Rnd 24: Ch 1, sc in each st, join and finish off

Continue here for chest length tail

Rnds 11- 33: Ch 3, tc in each st, join (58 stitches)

Rnd 34: Ch 1, sc in each st, join and finish off

Scroll down for the fin pattern.

crochet mermaid tail

Fin Pattern for Both Sizes

Lay your mermaid tail  flat and make sure that your stitches with the increases are in the middle (see figure 1)

Attach your yarn on the side of the tail in the space between rows 5 & 6 (see figure 2)

Working away from tail: –>
Working back towards tail: <–

Make your first sc in the space between rows 5 & 6. Continue to sc around the tc sts on each round and in the space between each round- you will sc down one side, sl st in the middle at the bottom, and continue to sc up the other side until you reach the area between rows 5 & 6, do NOT finish off, begin pattern below (see figure 3)

Row 1: (see figure 4) Ch 36, dc in 2nd ch from hook and in each rem ch, sl st in 2nd sc on tail (35 stitches)

Row 2: –> Ch 2, working in back loops dc 34 (34 stitches)

Row 3: <– sl st in first st, ch 2, working in front loops dc 33, sl st in 3rd sc on tail (33 stitches)

Row 4: –>Ch 2, working in back loops dc 32 (32 stitches)

Row 5: <–sl st in first st, ch 2, working in front loops dc 31, sl st in 4th sc on tail (31 stitches)

Row 6: –> Ch 2, working in back loops dc 30 (30 stitches)

Row 7: <– sl st in first st, ch 2, working in front loops dc 29, sl st in 5th sc on tail (29 stitches)

Row 8: –>Ch 2, working in back loops dc 28 (28 stitches)

Row 9: <– sl st in first st, ch 2, working in front loops dc 27, sl st in 6th sc on tail (27 stitches)

Row 10: –> Ch 2, working in back loops dc 26 (26 stitches)

Row 11: <– sl st in first st, ch 2, working in front loops dc 25, sl st in 7th sc on tail (25 stitches)

Row 12: –> Ch 2, working in back loops dc 24 (24 stitches)

Row 13: <– sl st in first st, ch 2, working in front loops dc 23, sl st in 8th sc on tail (23 stitches)

Row 14: –> Ch 2, working in back loops dc 22 (22 stitches)

Row 15: <– sl st in first st, ch 2, working in front loops dc 21, sl st in 9th sc on tail (21 stitches)

Row 16: –> Ch 2, working in back loops dc 20 (20 stitches)

Row 17: <– sl st in first st, ch 2, working in front loops dc 19, sl st in 10th sc on tail (19 stitches)

Row 18: –> Ch 2, working in back loops dc 18 (18 stitches)

Row 19: <– sl st in first st, ch 2, working in front loops dc 27, sl st in 11th sc on tail (17 stitches)

Row 20: –> Ch 2, working in back loops dc 16, 2 dc in last st (18 stitches)

Row 21: <– working in front loops, ch 2, 2 dc in 1st st, dc 17, sl st in 12th sc on tail (19 stitches)

Row 22: –> Ch 2, working in back loops, dc 18, 2 dc in last st (20 stitches)

Row 23: <– working in front loops, ch 2, 2 dc in 1st st, dc 19, sl st in 13th sc on tail (21 stitches)

Row 24: –> Ch 2, working in back loops, dc 20, 2 dc in last st (22 stitches)

Row 25: <– working in front loops, ch 2, 2 dc in 1st st, dc 21, sl st in 14th sc on tail (23 stitches)

Row 26: –> Ch 2, working in back loops, dc 22, 2 dc in last st (24 stitches)

Row 27: <– working in front loops, ch 2, 2 dc in 1st st, dc 23, sl st in 15th sc on tail (25 stitches)

Row 28: –> Ch 2, working in back loops, dc 24, 2 dc in last st (26 stitches)

Row 29: <– working in front loops, ch 2, 2 dc in 1st st, dc 25, sl st in 16th sc on tail (27 stitches)

Row 30: –> Ch 2, working in back loops, dc 26, 2 dc in last st (28 stitches)

Row 31: <– working in front loops, ch 2, 2 dc in 1st st, dc 27, sl st in 17th sc on tail (29 stitches)

Row 32: –> Ch 2, working in back loops, dc 28, 2 dc in last st (30 stitches)

Row 33: <– working in front loops, ch 2, 2 dc in 1st st, dc 29, sl st in 18th sc on tail (31 stitches)

Row 34: –> Ch 2, working in back loops, dc 30, 2 dc in last st (32 stitches)

Row 35: <– working in front loops, ch 2, 2 dc in 1st st, dc 31, sl st in 19th sc on tail (33 stitches)

Row 36: –> Ch 2, working in back loops, dc 32, 2 dc in last st (34 stitches)

Row 37: <– working in front loops, ch 2, 2 dc in 1st st, dc 33, sl st in 20th sc on tail (35 stitches)

Fasten off and weave in all of your ends.

mermaid tail crochet pattern