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Bring the magic of the ocean to life with this Amigurumi Under the Sea Mobile crochet pattern! Perfect for nurseries, playrooms, or anyone who dreams of seaside adventures, this enchanting mobile features a delightful collection of sea creatures—think smiling jellyfish, curious crabs, gentle turtles, and playful fish—all suspended in a whimsical underwater dance. Whether you’re crafting a handmade baby shower gift or adding a splash of ocean charm to your own space, this pattern lets you stitch up a floating world of aquatic wonder. 🐠🐙🌊

Designed for creativity and storytelling, this pattern invites you to mix soft pastels or bold brights, experiment with textures, and personalize each sea friend with expressive details like tiny fins, sleepy eyes, or even a sparkle of embroidery. Hang them from a wooden hoop or driftwood for a natural touch, and watch as your mobile sways gently like waves in the sea. This Amigurumi Under the Sea Mobile is a joyful and satisfying project—perfect for bringing a tide of handmade magic to every stitch! 💖🧶✨

A crochet mobile featuring a blue whale, a green turtle, and a starfish on a wave, with pink jellyfish hanging above them, set in a light blue room.

🌊 Under the Sea Mobile Crochet Pattern

Bring ocean dreams to life with this adorable baby mobile featuring a whale, sea turtle, starfish, jellyfish, and a wavy water base! These sweet sea creatures are ideal for nursery decor, crib mobiles, or ocean-themed gifts.

✨ Pattern Information

Skill Level

Intermediate – Requires basic amigurumi shaping, surface detail work, and light assembly skills.

Finished Sizes

Whale: 20 cm (8 in) long
Turtle: 10–12 cm (4–5 in)
Jellyfish: 15 cm (6 in) tall including tentacles
Starfish: 7 cm (2¾ in)
Wave base: 25–30 cm (10–12 in) across

🧶 Materials Needed

Yarn

Cotton or acrylic DK/light worsted weight yarn in the following colors:

Light blue, cream, white – Whale
Chartreuse/lime green, medium brown, cream – Turtle
Dusty pink, white – Jellyfish
Bright orange – Starfish
Light blue, medium blue, dark blue – Waves

Other Supplies

Crochet hook: 2.5–3.0 mm
Stuffing: Polyester fiberfill
Safety eyes: 6 mm black (or black embroidery thread)
Tapestry needle
Scissors
Stitch markers
Mobile hardware: Wooden hoop 25-30 cm diameter
Strong thread or cord for hanging

📖 Abbreviations

MR = Magic ring
ch = chain
sc = single crochet
hdc = half double crochet
dc = double crochet
tr = treble crochet
inc = increase (2 sc in same stitch)
dec = decrease (sc2tog)
sl st = slip stitch
FO = fasten off
× = times/repeat

🐳 Whale Pattern

Body (Light Blue)

Round 1: MR, 6 sc (6)
Round 2: inc ×6 (12)
Round 3: (1 sc, inc) ×6 (18)
Round 4: (2 sc, inc) ×6 (24)
Round 5: (3 sc, inc) ×6 (30)
Round 6: (4 sc, inc) ×6 (36)
Rounds 7–20: sc around (14 rounds even)
Round 21: (4 sc, dec) ×6 (30)
Round 22: sc around
Round 23: (3 sc, dec) ×6 (24)
Round 24: sc around
Round 25: (2 sc, dec) ×6 (18)
Round 26: (1 sc, dec) ×6 (12)

Stuff firmly, creating a smooth teardrop shape. FO, weave tail through remaining stitches and pull closed.

Belly Panel (Cream)

Round 1: MR, 6 sc (6)
Round 2: inc ×6 (12)
Round 3: (1 sc, inc) ×6 (18)
Round 4: (2 sc, inc) ×6 (24)
Round 5: (3 sc, inc) ×6 (30)
Round 6: (4 sc, inc) ×6 (36)

FO, leaving a long tail. Pin to underside of whale body and sew neatly around the edges.

Side Fins (Make 2 – Light Blue)

Round 1: MR, 6 sc (6)
Round 2: (1 sc, inc) ×3 (9)
Round 3: (2 sc, inc) ×3 (12)
Rounds 4–6: sc around (3 rounds)
Round 7: (2 sc, dec) ×3 (9)

Flatten and sew the opening closed. Attach to sides of body at a slight downward angle.

Tail Flukes (Make 2 – Light Blue)

Round 1: MR, 6 sc (6)
Round 2: inc ×6 (12)
Round 3: (1 sc, inc) ×6 (18)
Round 4: (2 sc, inc) ×6 (24)
Round 5: sc around

FO, leaving tail for sewing. Flatten each piece. Place the two flukes perpendicular to the body, sew them together at the center, then attach to the back of the whale horizontally.

Water Spout (White)

Make 2 small curls: ch 12, then sl st back down the chain to create a spiral.
FO. Sew both curls to the top of the head, slightly overlapping.

Face Details

Insert 6mm safety eyes between rounds 10-12, about 6 stitches apart
Embroider a gentle curved smile with cream or light gray yarn

🐢 Sea Turtle Pattern

Shell Top (Medium Brown)

Round 1: MR, 6 sc (6)
Round 2: inc ×6 (12)
Round 3: (1 sc, inc) ×6 (18)
Round 4: (2 sc, inc) ×6 (24)
Round 5: (3 sc, inc) ×6 (30)
Round 6: (4 sc, inc) ×6 (36)

FO, leave long tail for sewing.

Hexagon Shell Pattern (Cream Embroidery)

Using cream yarn and tapestry needle, embroider 6 hexagons on the brown shell:

1 center hexagon (approximately 6 stitches across)
5 hexagons surrounding it in a circle
Use backstitch or chain stitch to outline each hexagon shape

Belly (Chartreuse Green)

Round 1: MR, 6 sc (6)
Round 2: inc ×6 (12)
Round 3: (1 sc, inc) ×6 (18)
Round 4: (2 sc, inc) ×6 (24)
Round 5: (3 sc, inc) ×6 (30)

FO, leave tail for sewing.

Head (Chartreuse Green)

Round 1: MR, 6 sc (6)
Round 2: inc ×6 (12)
Round 3: (1 sc, inc) ×6 (18)
Rounds 4–8: sc around (5 rounds)
Round 9: (1 sc, dec) ×6 (12)

Stuff head firmly. Insert 6mm safety eyes between rounds 5-6, about 4 stitches apart. FO, leave tail for sewing.

Flippers (Make 4 – Chartreuse Green)

Round 1: MR, 6 sc (6)
Round 2: (1 sc, inc) ×3 (9)
Rounds 3–5: sc around (3 rounds)

Flatten and sew the opening closed. Attach 2 flippers to the front sides and 2 to the back sides of the body.

Turtle Assembly

Stuff the belly piece lightly
Sew the shell top to the belly, leaving an opening for the head
Insert the head and sew securely in place
Attach all 4 flippers
Embroider a small smile with dark thread or black yarn

🌸 Jellyfish Pattern (Make 2)

Bell Body (Dusty Pink)

Round 1: MR, 6 sc (6)
Round 2: inc ×6 (12)
Round 3: (1 sc, inc) ×6 (18)
Round 4: (2 sc, inc) ×6 (24)
Round 5: (3 sc, inc) ×6 (30)
Round 6: (4 sc, inc) ×6 (36)
Rounds 7–9: sc around (3 rounds)
Round 10 (Ruffle Edge): ch 3, sl st in same st, sl st in next st – repeat around

Stuff lightly. FO, weave in end.

Optional White Accent

With white yarn, add small French knots or tiny dots scattered on the bell for texture.

Tentacles (Make 9-10 per Jellyfish – Dusty Pink)

Ch 30, then work 2 sc in each chain back to the beginning to create a tight spiral curl.
FO, leaving a 6-inch tail.

Attach the tentacles evenly spaced around the bottom edge of the bell, distributing them in a circle.

⭐ Starfish Pattern

Body (Bright Orange)

Round 1: MR, 5 sc (5)
Round 2: inc ×5 (10)
Round 3 (Create Arms): ch 6, sl st in 2nd ch from hook, sc, sc, hdc, dc, skip 1 st on body, sl st in next st on body

Repeat from * 4 more times to create 5 arms total.

FO, weave in tail. The arms will naturally curl slightly.

Optional: Embroider 2 tiny black eyes near the center with black thread.

🌊 Three-Dimensional Wave Base

This wave has depth and curves naturally to create a realistic ocean effect.

Foundation (Dark Blue)

Ch 50

Row 1 (Dark Blue)

Sc in 2nd ch from hook, sc across (49 sc)

Rows 2-3 (Dark Blue)

Ch 1, turn, sc across

Rows 4-5 (Medium Blue)

Change to medium blue.
Ch 1, turn, sc across

Rows 6-7 (Light Blue)

Change to light blue.
Ch 1, turn, sc across

Row 8 (Wave Shaping – Light Blue)

Ch 1, turn, sc 3, hdc 2, dc 3, hdc 2, sc 3 – repeat pattern across, adjusting as needed to fit your stitch count

Row 9 (Wave Peaks – Light Blue)

Ch 1, turn, work in pattern creating peaks and valleys: sc, hdc, dc, tr, dc, hdc, sc, sl st – repeat across

FO, weave in all ends.

Creating the 3D Effect

Gently curve the wave piece into an arc or semi-circle
Tack the bottom edge to the mobile hoop with small stitches to hold the curve in place
Optional: Add light stuffing along the back edge before tacking to give more dimension
The wave should look like it’s rolling when viewed from the side

🔗 Assembly & Hanging Instructions

Preparing the Creatures for Hanging

Attach a 12-15 inch length of strong thread or fishing line to the top of each creature:

Whale: Thread through the top center of the head
Jellyfish: Through the center top of the bell
Turtle: Through the center of the shell
Starfish: Between two arms at the center

Arranging on the Mobile Hoop

Whale: Hang in center-front position at medium height
Jellyfish (2): Hang on either side of the whale at varying heights (one higher, one lower) for visual interest
Turtle: Position on the wave base (sew to secure)
Starfish: Attach to the wave base near the turtle
Wave base: Secure around the bottom portion of the hoop, curving it to follow the circular shape

Creating the Top Hanger

Attach 4 equal lengths of cord (each about 12-15 inches) to 4 evenly spaced points around the hoop. Gather all 4 cords at the center point above the mobile and tie securely. This creates a balanced hanging point.

💡 Customization Ideas

Add small white French knots to jellyfish bells for spotted texture
Embroider baby’s name on the whale’s belly panel
Include additional creatures like a small seahorse or octopus
Use glow-in-the-dark yarn for a magical nighttime effect
Add a small bell or rattle inside the turtle’s shell for gentle sound

⚠️ Safety Notes

Always hang the mobile securely out of baby’s reach
Position at least 16 inches (40 cm) above the mattress surface
Ensure all parts are securely sewn and cannot detach
Regularly inspect for wear or loose pieces
Remove mobile when baby can sit up or reach 5 months old

🎨 Tips for Success

Tension: Maintain consistent tension throughout for even shapes
Stuffing: Don’t overstuff – pieces should be firm but slightly flexible
Color selection: Feel free to adjust colors to match your nursery theme
Blocking: Gently shape pieces while slightly damp for best results
Thread strength: Use strong thread or fishing line rated for at least 5 lbs for hanging

This ocean mobile brings the calm beauty of the sea into any nursery – perfect for sweet underwater dreams! 🐳🐢✨