Free knitting patterns for baby onesies. Many of the patterns are free. Updated 6/15/26
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
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.
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.
More Free Patterns
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
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.
Gift Wrap Romper & Sweater
Baby romper onesie with options for long or short legs and sleeves as well as a striped or solid body. Sizes: NB (3m, 6m, 12m, 18m, 24m, 2T). Worsted weight yarn. Designed by Carina Spencer
Mushroom Butterfly Sweater or Mushroom Cardigan and Romper Set
Three baby patterns featuring mushroom designs. Mushroom and Butterfly Baby Sweater P110. Mushrooms Cardigan and Romper Set P093 + P105, also available separately. Sizes: Cardigan: Size: 0-6m/6-12m/12-18 months. Romper: Size: 6m/12m/18 months. Sweater: Size :6-12m/12-18m/18-24m/2-3 years. DK weight yarn. Designed by Swetla AnaSwet
Eve Romper
Baby playsuit carefully designed to be simple in construction, perfect for a beginner, knit in garter stitch throughout. Sizes included: 0-3 months, 3-6 months, 6-12 months & 12-24 months. Aran weight yarn. Designed by Pippyeve
Emily Baby Romper and Bonnet
Baby romper onesie bodysuit and matching bonnet with leaf lace edging with bobble berries. Great newborn photo prop. Sizes newborn to 2T. DK weight yarn. Designed by Natasha Gizamova of MimiKnitting.
Rompersuit and Hat
Baby onesie with long sleeves and legs, buttoned up the front, and matching hat knit with half Fisherman’s rib. Sizes Newborn to 3T. DK weight. Designed by MimiKnitPatterns
