Newborn Swaddle Sack Crochet Pattern Sleep Cocoon

This cozy newborn swaddle sack crochet pattern sleep cocoon creates a safe, breathable envelope design perfect for 0-3 month babies.

🤍
Difficulty
🟢 Beginner
Time
⏱️ 3-4 hours
Hook
🪡 G / 4.0mm
Yardage
🧶 approximately 350-400 yards
Finished Size
📏 18 inches long x 10 inches wide (flat, suitable for 0-3 months)
⚠️
Always make a gauge swatch before starting!
Gauge: 20 sc x 22 rows = 4 inches in single crochet
Adjust hook size as needed to match gauge.
📋

At a Glance

The Newborn Swaddle Sack Crochet Pattern Sleep Cocoon is a free Beginner-level baby pattern with a G / 4.0mm hook . Estimated time: 3-4 hours. Finished size: 18 inches long x 10 inches wide (flat, suitable for 0-3 months). You'll need approximately approximately 350-400 yards of yarn.

11 steps across 4 sections  ·  Free under CC BY-NC-SA 4.0 — you can sell finished items

🛒 Materials

Sport weight yarn
350-400 yards, breathable cotton or bamboo blend recommended for baby safety
Find on Amazon
Crochet hook
Size G / 4.0mm
Find on Amazon
Yarn needle
For weaving in ends
Find on Amazon
Stitch markers
Optional, for marking rows
Find on Amazon
Measuring tape
For checking gauge and measurements
Find on Amazon

📖 Abbreviations

ch — chain
sc — single crochet
hdc — half double crochet
st(s) — stitch(es)
sl st — slip stitch
BLO — back loop only
rep — repeat

📌 Before You Begin

💡

Pattern is worked flat from bottom up with envelope flap closure.

💡

Use breathable natural fibers like cotton or bamboo for baby safety.

💡

Ch 1 at beginning of rows does not count as a stitch.

💡

Always supervise baby while using swaddle sack.

💡

Swaddle should fit loosely around hips to allow natural leg position.

🧶 Pattern Instructions

💡 Tip: Count stitches every 10 rows to ensure consistency. The fabric should be soft but not too loose.
  1. Row 1
    Ch 51. Sc in 2nd ch from hook and in each ch across. Turn. (50 sts)
  2. Row 2
    Ch 1, sc in each st across. Turn. (50 sts)
  3. Rows 3-80
    Rep Row 2. (50 sts each row). This creates an 18-inch long body. Adjust length if needed by adding or removing rows.
Row counter:
💡 Tip: Keep edging loose and even for a professional finish.
  1. Row 81
    Ch 1, sc in each st across. Do not turn. (50 sts)
  2. Side Edging
    Continue working sc evenly along the long side edge, placing approximately 1 sc in each row end (about 80 sc). When you reach the bottom corner, work 3 sc in corner to turn. Sc across bottom foundation edge (50 sc). Work 3 sc in next corner. Sc evenly up the second long side (about 80 sc). Sl st to first sc of Row 81 to join.
  3. Final Round
    Ch 1, sc in each st around entire perimeter, working 2 sc in each corner st. Sl st to first sc. Fasten off.
Row counter:
💡 Tip: Leave sides open enough for baby to move freely. Test fit if possible before finalizing seams.
  1. Positioning
    Fold the crocheted rectangle in half widthwise so the bottom edge meets the middle. The top portion will fold down as the envelope flap.
  2. Side Seams - Right Side
    With right sides together, align the bottom folded edge with the middle section. Using yarn needle and working yarn, whipstitch or sc the right side edge closed for approximately 25-30 rows from the fold, leaving the top open for baby's head and shoulders.
  3. Side Seams - Left Side
    Repeat the seaming process on the left side, securing approximately 25-30 rows from the fold.
Row counter:
💡 Tip: Ties are optional. You can also use the swaddle as a simple open cocoon without ties for easier diaper changes.
  1. Tie 1
    Ch 40, sl st in 2nd ch from hook and in each ch across. Fasten off, leaving a 6-inch tail. Attach securely to the side edge of the flap on one side.
  2. Tie 2
    Repeat for second tie and attach to opposite side of flap at corresponding position.
Row counter:

✂️ Finishing

Weave in all ends securely using yarn needle, ensuring no loose ends can come free during use. Block gently if desired by laying flat and misting with water, then allowing to air dry completely. Check all seams for security and reinforce any weak points. The envelope flap should fold over comfortably across baby's chest. The swaddle should be roomy enough for baby to bend legs into natural frog position. Never place baby to sleep with loose ties near face. This swaddle is designed for supervised rest and cuddling.

🧺 Care Instructions

Machine wash gentle cycle in cold water using baby-safe, fragrance-free detergent. Place in mesh laundry bag to protect stitches. Lay flat to dry or tumble dry on low heat. Do not bleach. Avoid fabric softeners which can reduce breathability. Inspect regularly for wear, loose stitches, or damage. Discontinue use if any safety concerns arise. Always follow safe sleep guidelines.

🤖 This pattern was generated by AI and may contain errors. Always test your gauge before starting.

What's wrong with this pattern?

✓ Thanks for your feedback — we'll review it shortly.

Questions About This Pattern

Absolutely — just match the weight (Sport). You'll need about approximately 350-400 yards, so make sure your substitute has enough meterage. Fine yarns give delicate detail. Cotton is great for structured pieces; mohair adds a halo effect for a dreamy look.
Yes! This is one of the friendlier patterns to start with. You only need to know: ch, sc, hdc, st(s). Work slowly, count your stitches at the end of each row, and don't be afraid to frog (rip back) and redo a section — that's how everyone learns. Budget about 3-4 hours; beginners often take a bit longer, and that's totally fine.
Usually it's the joining or finishing — where individual sections meet and need to align. Read through the entire pattern once before you start so there are no surprises. Use stitch markers generously to track your place, especially in rounds. If a section looks wrong, count your stitches before proceeding — catching an error early saves a lot of frogging later.
For this pattern, gauge is "20 sc x 22 rows = 4 inches in single crochet". For decorative or non-fitted items it's less critical, but matching gauge ensures you use the right amount of yarn and get the proportions the pattern intends. If your swatch is too small (too many stitches/inch), go up a hook size. Too large — go down.
Machine wash gentle cycle in cold water using baby-safe, fragrance-free detergent. Place in mesh laundry bag to protect stitches. Lay flat to dry or tumble dry on low heat. Do not bleach. Avoid fabric softeners which can reduce breathability. Inspect regularly for wear, loose stitches, or damage. Discontinue use if any safety concerns arise. Always follow safe sleep guidelines. A general rule: when unsure about the yarn, hand wash in cool water with a drop of gentle detergent, squeeze (don't wring), and block flat to dry. This is safe for almost every fiber.
Each section builds on the last, so yes — follow them in order. That said, some finishing sections (like embellishments or optional edging) can be skipped if you prefer a simpler look. Read through all sections before starting so you understand how the pieces fit together and can plan your yarn usage across sections.