Crochet Heart Baby Cardigan Pattern (0-12 Months)

• LevelIntermediate
• Time6-8 Hours
• Hook3.0 mm
• YarnDK

About This Pattern

Materials

Crochet Abbreviations

ch

chain

st

stitch

sl st

slip stitch

sc

single crochet

hdc

half double crochet

Crochet Heart Baby Cardigan Pattern (0-12 Months)

Main Pattern

1. Round 1

   Work HDC around Join with sl st Ch 1 and turn

2. Round 2

   Work HDC around Join with sl st Ch 1 and turn For Row 3 Work HDC around Join with sl stFasten off Front Panel Borders Use 3.0 mm hook.

   Attach yarn at bottom of front panel edge Work HDC evenly around the outer edges of that front panel Do no the inner edge straight and neat

You will add 2 HDC rows to each front panel, but keep the center opening clean.

Part 2

1. Round 1

   t join across the inner front opening edge yet Keep Work HDC around outer edges Turn at the top and continue downKeep corners smooth with extra stitches if needed

2. Round 2

   Repeat HDC evenly Fasten off Measurement Check Lay left front, back, and right front flatAlign the top edges of the right front and back Use SC to join shoulder seams Shoulder seam steps Attach yarn at one shoulder edge

   Work SC through both layers across the shoulder Stop to leave a neckline opening in the center The tutorial leaves about 9 cm open for the neckRepeat on the other shoulder Join Side Seams With cardigan inside out, align side edges Sew or slip stitch from the bottom hem upwardWork SC or sl st through both layers up the side Stop when armhole opening is reached Fasten off Repeat for the other sideJoin Sleeve Motifs For sleeve 1, join 2 small heart squares together Use the zig zag slip stitch seam Repeat for sleeve 2Form Sleeve Tube Fold sleeve panel so short edges meet Join the sleeve seam to form a tube Use sl st or SC seam Leave top opening for attaching to cardigan

Arrange them as they will sit when worn Measure chest width across the combined piece Stop adding border rows when chest width reaches approximately 23 cm

Part 4 Joining Shoulders and Sides Join Shoulders Place back panel and two front panels together as a cardigan shape Align the top edges of the left front and back

Stop to leave the armhole opening The tutorial leaves about 10 cm open for the armhole Side seam steps Attach yarn at bottom corner

Sleeves Each sleeve is made from 2 small heart squares plus added HDC rounds for length.

More photos

Assembly Instructions

1. Step 1 Weave in all ends securely
2. Step 2 Check seams for gaps
3. Step 3 Lightly steam block if needed
4. Step 4 Confirm sleeves hang evenly and collar lies flat
5. Step 5 Your Baby Heart Cardigan is complete

Important Notes

• 💡 Keep your 3.0 mm and 2.5 mm hooks clearly separated as you work — the 3.0 mm is for the motif squares and body shaping, while the 2.5 mm is reserved just for the edging and collar for that firmer finish.
• 💡 Weigh out your 70 g of acrylic yarn before starting and track how much you use on the first few squares so you can tell early if you're on pace to finish all 12 squares comfortably.
• 💡 Since all 8 large squares should be identical, keep one finished square nearby as a visual and physical reference to compare against as you make squares 2 through 8.
• 💡 Use stitch markers to mark the first stitch of each new round on every heart square — with only 2-3 rounds per square it's easy to lose count without one.
• 💡 Lay your 4 large squares in the 2x2 grid layout and dry-fit them before joining, confirming which squares will form the back panel versus the left and right front panels.
• 💡 When making the 2 smaller squares per sleeve, complete both sleeve squares back to back so their reduced round count and finished size match exactly before joining.

Common Mistakes and Fixes

• Losing track of which round you're on within each heart square, especially since the large squares use 3 rounds and the small sleeve squares use fewer.

  Place a stitch marker in the first stitch of every round before you begin the next one, and jot down a tally after each square so you don't accidentally work an extra or missing round.

• Making the 4 small sleeve squares the same size as the 8 large body squares instead of scaling them down.

  Deliberately work fewer rounds or stop one round earlier on the sleeve squares — compare a finished sleeve square against a body square side by side before making all four to confirm the size difference is visible.

• Joining squares in the wrong order, mixing up which squares go into the back panel versus the front panels.

  Lay all 8 large squares out in your 2x2 grid layout before you join anything, and label or photograph the layout so you always join 4 squares into the back and 2 into each front panel correctly.

• Inconsistent tension across the 12 total squares, making some hearts look puffier or looser than others.

  Work all squares in one or two sittings if possible, and periodically measure a finished square against the 10 cm target size to catch tension drift early rather than after all squares are done.

• Skipping stitch markers when assembling, causing panels to shift out of alignment during the 5 assembly steps.

  Pin or clip squares together with locking stitch markers before you sew or slip stitch them, checking that corners line up exactly before committing to the seam.

Frequently Asked Questions

• How do I size this cardigan up beyond 0 to 3 months?

  Add extra rounds to your heart squares to make them larger, keeping the same number of squares in the layout. Just make sure to add the same number of extra rounds to both the large body squares and the small sleeve squares so the proportions stay consistent.

• Why are the sleeve squares smaller than the body squares?

  The sleeves use 4 smaller heart squares worked with fewer rounds so they scale down proportionally to fit a baby's arm rather than matching the larger 10 cm body squares. This keeps the heart motif look consistent across the whole cardigan while adjusting the size where needed.

• Do I need both hook sizes to finish this pattern?

  The 3.0 mm hook is essential for the motif squares and body shaping, but the 2.5 mm hook is optional and only recommended if you want a firmer, neater edging and collar. You can use just the 3.0 mm throughout for a softer overall finish.

• How many squares total do I need to make before assembly?

  You'll make 12 squares in total: 8 large heart squares for the body panels and 4 smaller heart squares for the sleeves. Once all 12 are finished, the 5 assembly steps guide you through joining them into the complete cardigan.

Original pattern: https://crocheteverything.com/crochet-heart-baby-cardigan-pattern-free-for-0-to-12-months-old/

About the Author

Marisol QuinteroWho runs Crochet Obsessed, why a stitch count sits at the end of every round, how a pattern gets written here, and the things this site will never do.