Free knitting patterns for baby onesies. Many of the patterns are free. Updated 7/3/2026
To get the knitting patterns, scroll down the page to the individual pattern you want and click on the link to that pattern.
These patterns are not my designs but links to other designers who have generously shared their patterns. If you have questions about how to knit a specific pattern, please contact the designer directly.
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Free Patterns
Playtime Romper
Baby and toddler size onesie knit with stockinette stitch and a slipped stitch texture with button fastening between the legs for easy changes. Worsted weight yarn. Sizes 3 months to 4 yrs. Designed by Olaug Beate Bjelland. Available in English, German, Norwegian, Swedish
Butterfly Frilly Romper
Baby romper knit with ruffles up the bib and straps and button fastening between the legs for easy changes. DK weight yarn. Sizes 3 months to 12 months. Designed by Gustav and Berta.
Baby Onesie
Baby romper with button fastening in back, colorful stripes and playful elephant knit flat with short sleeves. Fingering weight yarn. Sizes 3 months to 12 months. Available in English, Dutch, French, German, Italian, Spanish. Designed by Katia. Tip for US knitters: If asked for country, select United Kingdom. May only be free for a limited time.
Starry Sky Romper
Easy baby body suit knit in a tube with a 4 round repeat star stitch with ribbed borders. Add straps and buttons and you're done. Sizes Newborn to 12 months. The newborn and 3 months sizes use one 100g skein of DK weight yarn. Designed by Lillegulls by r.bjoe. Available in English and Norwegian
Baby Onesie
Baby romper with button fastenings. Uses just one skein 100g of DK yarn for Newborn - 3 months size. Other sizes 6-9, 12-18 months. Designed by Premier Yarns.
Garter Stitch Baby Romper
Easy one skein onesie for baby or dolls knit flat with garter stitch. Sizes Preemie to 3 months. Uses one skein of DK weight yarn. Designed by marianna mel.
More Free Patterns
Baby Romper with Optional Ruffles
Baby onesie with star-shaped lace, pinafore front, and optional ruffles. Worked as two pieces knit with minimal shaping and basic stitches. Size 0, 3-6, 6-12, 12 months. Worsted weight yarn. P040 designed by Lincraft.
Strawberry Shorts Set
Baby romper and headband set with a strawberry theme. Perfect outfit for newborn and baby photo props. Sizes Newborn, 0-3 Months, 3-6 Months, 6-12 Months, 1-2 Years. Designed by Melody Rogers. DK weight yarn. Web version is free. PDF available for purchase
Anchors Away Romper
Baby onesie romper with nautical theme of anchor motif and stripes. Buttons on shoulder for easy dressing. Sizes: To Fit Age: 3 to 12 Months. Designed by Patons. DK weight yarn.
Esteban Baby Romper
Baby romper onesie with straps. Sizes 0-3, 3-6 month. Uses just one skein 109 - 131 yards (100 - 120 m) of DK yarn. Pantalón Esteban Designed by maria del puerto fernandez.
Baby Shorts with Buttoned Straps
Baby romper shorts knit flat on 2 needles. No picking up stitches. Sizes Newborn to 12 months. Uses one skein of DK/Worsted weight yarn. Designed by Lincraft.
Benni Bloomers
Baby and toddler romper bloomers with straps with ruffles along edges. Sizes 1 yrs (2 yrs) 3 yrs. Fingering weight yarn. Designed by Knit Gang for Hobbii Design.
Eclipse Onesie
Baby onesie in eclipse themed black and gray with sunshine peaking out at the trim. The yoke features wolf heads inspired by the wolf's special bond with the moon. Sizes 3 months to 1 year. Rocky Designed by Charlotte Kaae for Filcolana. Available in English, Danish, German
Patterns for Purchase
Reyes Baby Romper
Baby onesie with ruffles around arms, a faux cable yoke, and optional ribbons around legs. Sizes: 0-3 months. Designed by BebeMimosin. 4 ply weight yarn.
Rustic Romper
Baby onesie knit with a simple knit/purl design based on traditional guernsey patterns. Sizes 6, 12, 18 months. DK weight yarn. Designed by Annie Dempsey.
Amelia Romper
Baby wrapped onesie bodysuit with ruffle. Sizes: 0-1 months to 2T. Designed by MimiKnitPatterns. Sport weight yarn.
Bosque Baby Romper
Baby onesie knitted flat with a delicate “Growing leaves” central lace pattern and a lace band along the armholes that continues in the shoulder strips. Sizes Preemie to 18 months. Most sizes use just 1 ball 100g of DK weight yarn. Designed by Cecilia Fameli.
Wild Strawberries Cardigan and Romper
Baby garter stitch cardigan with strawberry plants with strawberries, flowers, and leaves. You can also get a set with a cardigan and romper. Sizes 3 months/6-12 months/ 12-18 months. Designed by AnaSwet. DK weight yarn.
Watermelon Baby Romper Onesie Set
Baby set of watermelon themed romper, hat, mittens, and booties. Fingering weight yarn. Designed by TBeeCosy
Bubble Stitch Romper and Cardigan
Matching baby onesie and sweater knit with the bubble stitch. Sizes Newborn to 24 months. DK weight yarn. Designed by Julie Taylor.
