Absolutely! Let’s break this down carefully. I’ll give you a detailed, step-by-step guide for crocheting a simple baby girl cardigan, including materials, measurements, and instructions. This will focus on a basic design suitable for beginners.

Materials Needed
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Yarn: Soft baby yarn (DK/light worsted, approx. 150–200 g)
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Hook: Size recommended on yarn label (usually 4.0–4.5 mm)
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Buttons: 3–4 small buttons
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Other tools: Yarn needle, scissors, stitch markers (optional)
Measurements (Approximate)
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Age: 0–6 months
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Chest: 16–18 inches
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Length: 10–12 inches
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Sleeve length: 6–7 inches
Adjust measurements proportionally for older babies.

Basic Stitches Used
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Chain (ch)
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Slip stitch (sl st)
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Single crochet (sc)
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Double crochet (dc)
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Half double crochet (hdc)
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Increasing: 2 stitches in one stitch
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Decreasing: Crocheting 2 stitches together
Step 1: Make the Back Panel
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Foundation chain: Chain about 42–50 stitches (depending on desired width).
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Row 1: Dc in 3rd chain from hook, continue dc across. Turn.
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Row 2 onward: Chain 2 (counts as first dc), dc across.
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Continue: Repeat until piece measures about 10–12 inches.
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Fasten off and set aside.

Step 2: Make the Front Panels (2 pieces)
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Foundation chain: About half the width of back panel plus 1–2 extra stitches for overlap.
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Rows: Work same as back panel (dc stitch).
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Length: Same as back panel.
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Shape neckline: On last 2–3 rows, decrease 1 dc at the inner edge to make a gentle curve for the neckline.
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Make 2 pieces (left and right front).
Step 3: Make the Sleeves (2 pieces)
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Foundation chain: Approx. 20–24 stitches.
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Row 1: Dc across, turn.
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Rows 2 onward: Dc across, increasing 1 dc at each end every 4th row until sleeve reaches desired width.
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Length: Approx. 6–7 inches.
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Make 2 sleeves.

Step 4: Assembly
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Shoulders: Sew front panels to back panel at the shoulders.
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Attach sleeves: Align the center of sleeve top with shoulder seam, sew along armhole.
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Side seams: Sew sides from bottom edge to underarm, including sleeve seams.
Step 5: Add Button Band & Finishing
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Button band: Pick up stitches along front edges with sc or hdc.
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Left front: sc all along for buttonholes (make small gaps for buttons).
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Right front: sc across.
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Buttons: Sew buttons to match buttonholes.
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Neckline & Bottom Edge: Optional: Crochet 1–2 rows of sc around neckline and bottom for a neat finish.
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Weave in all ends.

Tips for a Baby-Friendly Cardigan
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Use soft, washable yarn (acrylic or cotton blends).
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Avoid sharp edges; all seams should be flat and smooth.
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Ensure buttons are securely attached to prevent choking hazards.
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You can decorate with a small crochet flower or bow for a cute touch.
If you want, I can also make a diagram with stitch counts and measurements, showing exactly how many stitches for each panel and where to increase/decrease. That makes it super easy to follow for a first-time cardigan project.
Do you want me to create that diagram?
Watch tutorial: