Size Guide – Morning Marvels
GBP
A young girl with blonde hair sits in an old wheelbarrow, wearing a straw hat and an orange dinosaur-print vest. She gazes at the camera with a playful yet serene expression.A young girl with blonde hair sits in an old wheelbarrow, wearing a straw hat and an orange dinosaur-print vest. She gazes at the camera with a playful yet serene expression.

Size Guide

Size Guide

Take me straight to the Body Measurements

Who hasn't gone mental trying to figure out what size to buy for their kids? We probably would have been able to fly to the moon and back with the time we have spent trying to understand measurement. We wish we had a magic wand to tell you exactly what the right size is, but until we figure that one out, we've put together this handy guide and when in doubt you can always contact us. 

Our clothing accommodates a range of measurements within each age group, ensuring comfortable wear as your child grows. For maximum longevity, we suggest looking at the height of your child and going for the size which will give them some extra room to grow. For example, if your child is close to the maximum height for their size, consider going up. You didn’t hear this from us, but rumour has it that Adeline and Anaïs (both above 164cm in height) happily snuggle up at night in the size 13Y pyjamas!

Morning Marvels 

You child’s size

3Y: 86 - 98cm

80 - 90cm → 3Y

90+ cm → size up to 5Y

5Y: 104 - 110cm

104 - 108cm → 5Y

110+ cm → size up to 7Y

7Y: 116 - 122cm 

116 - 120cm → 7Y

120+ cm → size up to 9Y

9Y: 128 - 134cm

128 - 132cm → 9Y

132+ cm → size up to 11Y

11Y: 140 - 146cm

140 - 144cm → 11Y

144+ cm → size up to 13Y

13Y: 152 - 158cm

13Y


For 3Y long PJs : If your child’s head circumference is above 51cm/ 20”, and they need a wider head opening in order to be comfortable, then you should size up. However, if your child is not bothered by the collar being slightly tighter when dressing, you can fit a 52.5cm head just fine. Even our founder’s extra small head of 54cm (though no small brain!) was able to fit through it.

Body measurement in cm
3 years 5 years 7 years 9 years 11 years 13 years
Age (year) 3Y 5Y 7Y 9Y 11Y 13Y
Height 86/98 104/110 116/122 128/134 140/146 152/158
Chest 55 59 63 57 72 77
Waist 51 54 57 59 61 66
Hips 59 63 57 71 75 81


Body measurement in inches
3 years 5 years 7 years 9 years 11 years 13 years
Age (year) 3Y 5Y 7Y 9Y 11Y 13Y
Height 34/39 41/43.5 46/48.5 50.5/53 55.5/57.5 60/62.5
Chest 21.65 23.22 24.8 26.38 28.35 30.31
Waist 20.08 21.26 22.44 23.23 24.01 25.99
Hips 23.23 24.8 26.38 27.95 29.52 31.89

 

For 3Y long PJs : If your child’s head circumference is above 51cm/ 20”, and they need a wider head opening in order to be comfortable, then you should size up. However, if your child is not bothered by the collar being slightly tighter when dressing, you can fit a 52.5cm head just fine. Even our founder’s extra small head of 54cm (though no small brain!) was able to fit through it. 

Growth-Friendly Features
Every piece features adaptable design elements like rollable sleeves and adjustable hems, letting you customise the fit as needed. This smart design approach extends the garment's wearability through growth spurts.

Fabric Care & Quality
The fabric we use combines exceptional softness with natural moisture-wicking properties, keeping your child comfortable throughout their busy day.

  • Machine wash at 30°C (86°F)

  • Natural shrinkage may occur due to the nature of our fabrics

  • Garments maintain their softness through repeated washing

We’ve put together a handy care guide

Need Help? For personalised sizing assistance, our team is ready to help help@morning-marvels.com

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