Helping you find the perfect fit

Our pieces are designed to be a nice fit for your little one. We go through extensive testing and sampling to make sure of this. To us, that means not too tight, but with room to grow.

Size Guides & Product Information


Our sleepsuits are more flexible with size than other sleepsuits thanks to the foldover SleepySocks, which allows for longer legs and extra growing space.


Up to 4.1kg / 9lbs
Up to 56cm / 22in

0-3 Months
Up to 5.7kg / 12lbs 6oz
Between 56-62cm / 22-24in

3-6 Months
Up to 7.4kg / 16lbs 3oz
Between 62-68cm / 24-24in

6-9 Months
Up to 8.8kg / 19lbs 4oz
Between 68-7cm / 27-29in

9-12 Months
Up to 9.9kg / 21lbs 8oz
Between 74-80cm / 30-31in

12-18 Months
Up to 11.3kg / 24lbs 9oz
Between 80-86cm / 32-33in

18-24 Months
Up to 12.4kg / 27lbs
Between 86-92cm / 34-36in

2-3 Years
From 13kg / 28lbs
Between 92-98cm / 36.2-38.5in

GrowSuits should always have a snug, yet comfortable fit on little ones for safety reasons.


Our pyjamas are designed to be a snug, comfortable and soft fit.

12-18 Months

11.3kg / 24lbs
86cm / 34in

18-24 Months
12.4kg / 27lbs
92cm / 36in

2-3 Years
14.5kg / 32lbs
98cm / 39in

3-4 Years
Weight: n/a
103cm / 40in

4-5 Years
Weight: n/a
110cm / 43in

5-6 Years
Weight: n/a
116cm / 46in

Sleeping Bags

GrowGrows Smart Sleeping Bags come in one expandable size designed to fit babies from newborn up to 2 years.

Baby's weight:
Fom 4kg up to 13kg / From 8lbs 8oz up to 28lb 6oz.

Baby's height:
From 56cm up to 92cm / From 22in up to 36in

Smart Sleeping Bags come in three togs:
0.5 tog
1.5 tog
2.5 tog

We advise that our Smart Sleeping Bags are only used from 4kg (8lbs 8oz) upwards to ensure small babies don't slip down into the sleeping bag.


Soft, snug and stylish fitting roll-up hats:

3-6 Months

Width at base: 20cm / 7.9in

Turn up depth: 3.5cm / 1.4in

Hat height (rim turned up): 14cm / 5.5in 

6-12 Months

Width at base: 21cm / 8.3in

Turn up depth: 3.5cm / 1.4in

Hat height (rim turned up): 14.5cm / 5.7in

1-2 Years

Width at base: 22cm / 8.7in

Turn up depth: 3.5cm / 1.4in

Hat height (rim turned up): 15cm / 5.9in


Our handkerchief shaped bibs are the perfect GrowSuit protector and come in one size only perfect from newborn upwards.

Width: 33.5cm / 13.2in

Size Adjustable: Three poppers to adjust size as they grow

Measuring Tips

GrowSuit and Pyjamas
To measure a small baby, lay them down and place a measuring tape alongside them from the top of their head to the bottom of their little heel. Wriggling is highly probable so set aside a good ten minutes to complete this task.

For those on their feet, you can measure them standing from head to heel too (if you can keep them still for long enough).

Take a soft measuring tape and gently wrap the tape around the little one's head measuring across from the forehead. We know this can be a challenging good luck!