Steel & Plaid Knitted Onesie


Baby Clothing Size Guide
How to measure your baby

Taking baby measurements

Height: measure from the top of the head to the floor

Chest: measure the fullest part of the chest, across the shoulder blades

Waist: measure around the natural waistline

Hip: measure around the fullest part of the hip

Newborn56cm3.5kg up to 8Ibs38cm36cm34cm
0-3m62cm6kg up to 13Ibs43.5cm40.5cm42.5cm
3-6m68cm8kg up to 17Ibs46cm42.5cm46cm
6-12m71cm - 74cm10kg up to 22Ibs48cm43.3cm48cm
12-18m74cm - 80cm-50cm45cm50cm
18-24m80cm - 92cm-51cm46.5cm51cm
24m86cm - 92cm-52cm49cm53cm



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🩶 Nextday UK Delivery £3.99

🩶 Standard UK Delivery £3.29

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Boy’s steel & plaid knitted onesie from British brand; Pex. A classic choice for everyday use, or for any special occasion. Featuring a steel coloured body with a plaid peter pan collar & button detail to the centre.

Finished with button fastening to the back & crotch for easy dressing & changing; a necessity for every baby outfit! This steel & plaid knitted onesie is a must-have for your baby boy’s wardrobe.

Lastly, it is designed by Pex, so you can be confident that you are buying quality without the price tag.  It is the cutest addition to your little one’s wardrobe & makes the perfect gift for any upcoming new arrival.

Why we love it:

  • Button fastening makes changing in & out easier.
  • Soft cotton for a comfortable fit.
  • Collar contrast creates a premium finish.

Fit & Fabric

  • Composition: 100% acrylic cotton
  • Origin: Portugal.
  • Brand: Pex
  • Size Range: Newborn to 9 months.
  • Lully Tip: Size up for best fit (e.g. 6 months = 3-6 months fit)

Our boy’s collection features timeless quality clothing that is designed to keep your baby boy comfortable & cosy. From knitted two pieces, to classic h-bar dungaree sets, we have created a boys’s wardrobe that is easy to wear and looks adorable. A thoughtful range ensures gentle fabrics, designs, and fastenings for a comfortable, and effortless look – the perfect choice for your little one boy’s everyday wear.

We advise our customers to refer to the size guide for the best fit for their little ones. After all, we know how quickly children grow, so we want to ensure you are choosing the right size for maximum comfort & longevity. 

Need more inspiration? Shop our related collections:

Boys Collection
Boys Footwear


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