Onesie in Sirdar Snuggly 100% Cotton - 5276 - Downloadable PDF

Sirdar Snuggly 100% Cotton Baby Onesie – Knitting Pattern 5276

This downloadable PDF knitting pattern from Sirdar provides full instructions for knitting a classic baby onesie, also known as a playsuit, in Sirdar Snuggly 100% Cotton Double Knitting yarn. Rated as an intermediate level project, this pattern is thoughtfully designed for babies and toddlers, covering sizes from 0–6 months, 6–12 months, and 1–2 years. The finished garment is a practical, all-in-one bodysuit that combines comfort with style, making it an ideal handknitted gift or wardrobe staple for little ones.

Designs Included in This Pattern

The pattern features two colourway versions of the same onesie design, each creating a distinctly different look through the use of two contrasting shades of yarn:

• Onesie in Navy and Light Grey – worked in shade 758 Navy as Yarn A and shade 757 Light Grey as Yarn B, offering a classic, gender-neutral combination with a crisp, modern feel.
• Onesie in Raspberry and Rhino – worked in shade 755 Raspberry as Yarn A and shade 759 Rhino as Yarn B, creating a vibrant, playful contrast that is eye-catching and cheerful.

The pattern also suggests additional shade options for knitters who wish to personalise their project, including 771 Yellow and 767 Spearmint, giving plenty of creative flexibility within the same design structure.

What Is Being Made

The finished item is a knitted baby onesie — a one-piece garment that covers the body and features short sleeves and poppered or buttoned fastenings to allow for easy dressing and nappy changes. The pattern includes measurements for chest, full length, and sleeve length across all three sizes:

• 0–6 months: 41cm chest, 58cm full length, 7cm sleeve length
• 6–12 months: 46cm chest, 63cm full length, 8cm sleeve length
• 1–2 years: 51cm chest, 72cm full length, 8cm sleeve length

Five buttons are required for all sizes, and the pattern references the Sirdar Elegant button, code B5611-0626, as a recommended finishing accessory.

Yarn and Materials

This pattern is written specifically for Sirdar Snuggly 100% Cotton DK, a premium double knitting weight yarn spun entirely from cotton fibre. This yarn has been specially developed to retain its softness, shape, and colour through repeated machine washing — an essential quality for baby garments. It is available in 50g balls across 24 shades and is noted for being breathable, gentle on sensitive baby skin, and kind to delicate complexions.

• Yarn A: 2 balls for 0–6 months; 3 balls for 6–12 months and 1–2 years
• Yarn B: 2 balls for 0–6 months and 6–12 months; 3 balls for 1–2 years
• Needles: One pair of 4mm (UK8 / USA6) knitting needles and one pair of 3¼mm (UK10 / USA3) knitting needles
• Notions: Stitch holders, 5 buttons

Knitting Techniques and Stitches Used

As an intermediate rated pattern, this onesie is suitable for knitters who are comfortable with the basics and ready to develop their skills further. The use of two yarn colours and the construction of a shaped, fitted garment with fastenings introduces techniques that go beyond simple beginner projects.

• Two-colour knitting – working with Yarn A and Yarn B to create contrast detailing across the garment
• Tension and gauge management – the required tension is 22 stitches to 10cm over stocking stitch on 4mm needles, which is standard