Size & Fit Guide
Senseng · Size & Fit Guide
Find the right size, the first time.
Babies do not grow by the calendar. Our charts are built on weight and height first and month bands second, so you can choose the size that actually fits — not the one the label suggests.
- Sized by weight + height
- ± 1–2 cm hand-measuring tolerance
- Between sizes? Size up
- US · UK · EU and month bands
1
Choose by weight and height
Two tables cover everything we make. Find your child's weight, confirm it against the height range, then check the month band. The last column tells you how many pieces are worth buying in that size.
| Size Tag | US Size | UK Size | EU Size (Height) | Weight Range | Suggested Quantity |
|---|---|---|---|---|---|
| 0–3M | 0–3M | 0–3M | 56–62 cm | 5–7 kg / 11–15 lb | 4–6 pcs: Newborns spit up and leak diapers frequently, requiring frequent changes. Babies grow fast, so do not overstock. |
| 3–6M | 3–6M | 3–6M | 62–68 cm | 7–8.5 kg / 15–19 lb | 4–5 pcs: Rollers who love to wiggle, higher chance of getting dirty. |
| 6–12M | 6–12M | 6–12M | 68–74 cm | 8.5–10 kg / 19–22 lb | 3–4 pcs: Crawling stage; this size has the longest wearing cycle. |
| 12–18M | 12–18M | 12–18M | 74-80 cm | 10–11.5 kg / 22–25 lb | 3–4 pcs: Toddler learning to walk, high activity level, stock a moderate amount. |
| 18-24M | 18-24M | 18-24M | 80-86 cm | 11.5-13 kg /25–29 lb | 2–3 pcs: Some children skip sizes, so stocking up in large quantities is not recommended. |
How to read it: the EU height range is the same measurement as your child's standing height. When the month band and the weight range disagree, follow the weight.
| Size Tag | US Size | UK Size | EU Size (Height) | Recommended Age / Height | Suggested Quantity |
|---|---|---|---|---|---|
| 1T | 12–18M / 1T | 12–18 Months | 80–86 cm | 1 Year (75–85 cm) | 2-3 pcs |
| 2T | 2T | 1.5–2 Years | 86–92 cm | 2 Years (85–92 cm) | 2-3 pcs |
| 3T | 3T | 2–3 Years | 92–98 cm | 3 Years (92–98 cm) | 2-3 pcs |
| 4T | 4T | 3–4 Years | 98–104 cm | 4 Years (98–104 cm) | 2-3 pcs |
| 5T | 5T | 4–5 Years | 104–110 cm | 5 Years (104–110 cm) | 2-3 pcs |
| 6T | 6/6X | 5–6 Years | 110–116 cm | 6 Years (110–116 cm) | 2-3 pcs |
2
Garment measurements by style
Every style is measured the same way — flat, unstretched, edge to edge, in centimetres. Pick your style to see the measurements for each size band.
Bodysuits & OnesiesChest (cm) · Length (cm)
| Size | Chest | Length |
|---|---|---|
| 0-3M | 46 | 34 |
| 3-6M | 49 | 37 |
| 6-12M | 52 | 40 |
| 12-18M | 55 | 43 |
| 18-24M | 58 | 46 |
Rompers & All-in-onesLength (cm) · Sleeve (cm)
| Size | Length | Sleeve |
|---|---|---|
| 0-3M | 46 | 15 |
| 3-6M | 52 | 17 |
| 6-12M | 58 | 19 |
| 12-18M | 64 | 21 |
| 18-24M | 70 | 23 |
Tops & TeesChest (cm) · Length (cm) · Shoulder (cm)
| Size | Chest | Length | Shoulder |
|---|---|---|---|
| 0-3M | 59 | 28 | 25 |
| 3-6M | 62 | 31 | 26 |
| 6-12M | 65 | 34 | 27 |
| 12-18M | 68 | 37 | 28 |
| 18-24M | 71 | 40 | 29 |
Bottoms & LeggingsWaist (cm) · Length (cm)
| Size | Waist | Length |
|---|---|---|
| 0-3M | 41 | 28 |
| 3-6M | 44 | 30 |
| 6-12M | 47 | 32 |
| 12-18M | 50 | 34.5 |
| 18-24M | 53 | 37 |
Dresses & SkirtsChest (cm) · Length (cm)
| Size | Chest | Length |
|---|---|---|
| 0-3M | 45 | 34 |
| 3-6M | 48 | 38 |
| 6-12M | 51 | 42 |
| 12-18M | 54 | 46 |
| 18-24M | 57 | 50 |
Two-Piece SetsChest (cm) · Length (cm) · Waist (cm)
| Size | Chest | Length | Waist |
|---|---|---|---|
| 0-3M | 46 | 25 | 41 |
| 3-6M | 49 | 28 | 44 |
| 6-12M | 52 | 31 | 47 |
| 12-18M | 55 | 34 | 50 |
| 18-24M | 58 | 37.5 | 53 |
Tolerance: all garment measurements are taken by hand and carry a ± 1–2 cm tolerance. Accessories — hats, bonnets, mittens and blankets — are cut to a single size; use the head circumference or the dimensions shown on the product page.
3
How to measure
Measure the child wherever you can, and the garment only when you need to compare it with one you already own. Lay the piece flat and do not stretch it.
1
Chest / width
Across the chest, about 1 cm below the armhole, edge to edge on a flat garment — not all the way around the body.
2
Length
From the highest point of the shoulder, or the centre-back neck, straight down to the hem. On a bodysuit, down to the crotch.
3
Sleeve
From the shoulder point along the top of the sleeve to the cuff edge, measured flat.
4
Waist
Across the waistband, edge to edge, with the elastic relaxed — never stretched out.
5
Hip
Across the fullest part of the hip, roughly 18–20 cm below the waistband, edge to edge.
6
Inseam
From the crotch seam straight down the inside of the leg to the hem.
7
Head
Around the widest part of the head, just above the ears and across the middle of the forehead.
Each diagram below marks the points we measure for that style. Find the one that matches what you are buying.
4
Women's & Mommy-and-Me styles
Our women's styles are cut to letter sizes. The measurements below are full body circumference in centimetres — not the half-width figure printed on some product charts.
| Size | Bust (cm) | Waist (cm) |
|---|---|---|
| XXS · 6 | 78.5 | 65.5 |
| XS · 8 | 85 | 69 |
| S · 10 | 90 | 74 |
| M · 12 | 95 | 79 |
| L · 14 | 100 | 84 |
| XL · 16 | 105 | 89 |
Hip: hip measurements vary with the cut of the style, so they are given on each product page rather than assumed here. If you are between two letter sizes, take the larger one.
Every measurement on this page is taken by hand on a flat, unstretched garment. If a number you need is missing, tell us which style and which point, and we will measure it for you.
Ask us to measure it→5
Sizing questions
The five things parents ask us most about size and fit.
How do I choose a size if I don't know my baby's exact weight?
Start with the month band, then confirm with height. Every size in the tables above carries a weight range and an EU height range, so if you only know one of the two, use height — it is the easier one to check with a tape measure against a doorframe. When the month band and the weight range point at different sizes, go with the weight.
My baby is between two sizes — should I size up or down?
Size up. That is the guidance on our product pages, and it is also the choice that keeps a piece wearable for longer: the smaller size is the one that stops fitting first, while the larger size still works as your baby grows into it.
What do the numbered points in the measuring diagrams mean?
Each diagram marks the points we measure for that particular style, numbered ① ② ③ and so on. ① is normally chest or width, ② length and ③ sleeve, but the order follows each style's own chart — read the diagram for the style you are buying. All garment measurements are taken with the piece laid flat and unstretched, edge to edge.
Why does a 6–12M tag start at 8.5 kg?
Because the size bands are built on weight first. The month band is simply the quickest way to find the right row; the weight range is what tells you whether that row is your row. Two babies of the same age but different weights should not be in the same size, so when the two disagree, follow the weight.
Are the measurements exact?
They are taken by hand, flat, on a sample piece, and carry a ± 1–2 cm tolerance — the same tolerance you will see quoted on our product pages. Two pieces of the same size can differ slightly at a seam. If a measurement you need is not published for a style, measure a garment you already own that fits well and compare it to the chart; that is more reliable than converting from another brand.
