If you’re searching for what size nappy an older child needs, you’ve probably already discovered that most sizing guides stop at toddlers. The information gap is frustrating — and unhelpful. This guide covers practical sizing for children aged 4 and upward, including pull-ups, taped briefs, and specialist continence products, so you can find something that actually fits.
Why Sizing for Older Children Is More Complicated
Children’s nappy sizing has historically been designed around potty training, which means most mainstream products top out at around 18–20 kg. For children who are larger, older, or simply not yet dry at night, the standard sizing charts are next to useless.
The challenge is that weight alone doesn’t determine fit. Hip width, waist circumference, and thigh girth all affect how well a product seals — and for overnight use, a poor fit is the most common cause of leaks. A child who is tall and slim may need a different size than a child of identical weight who carries more weight around the hips.
For children with additional needs, including autism or sensory processing differences, fit matters even more: a product that gaps, bunches, or pulls at the wrong point may simply be refused regardless of its absorbency.
Product Types and What Sizing Looks Like for Each
Pull-Ups (Training Pants Style)
Pull-ups are the most familiar format for older children and the easiest to introduce. The most widely available options in the UK include:
- DryNites Pyjama Pants: Available in 4–7 years (15–30 kg) and 8–15 years (27–57 kg). These are the most commonly purchased starting point and are stocked in most supermarkets and pharmacies.
- Lille Healthcare SupremFit Pull-Up: Available in sizes from S to XL, covering waist measurements from approximately 60 cm to 150 cm — making them suitable for older teenagers and adults.
- TENA Pants: Designed for adults but available in sizes that work for larger teenagers. TENA Pants Plus and TENA Pants Maxi offer higher absorbency than most children’s products.
- Abena Pants: A well-regarded specialist brand offering pull-up style products in multiple absorbency levels and sizes including S, M, L, and XL.
The sizing approach for pull-ups is usually based on hip/waist measurement rather than weight alone. If your child is between sizes, go larger — a slightly loose fit is easier to manage than one that digs in or compresses the leg cuffs flat, which is one of the leading causes of leg leaks overnight. For more on that specific problem, see What Happens to Pull-Up Leg Cuffs When a Child Lies Down.
Taped Briefs (Nappy Style)
Taped products — sometimes called slip-style or all-in-one briefs — offer a closer, more adjustable fit and typically higher absorbency. They are unfairly stigmatised but are an entirely appropriate choice when they work better than pull-ups, particularly for heavier wetters or children who leak consistently through pull-up formats.
- Pampers Nappy Pants / Pampers Baby Dry: The largest standard size (Size 7) fits children from approximately 15 kg upward, but the fit is optimised for toddlers and may be too narrow for older children even at the right weight.
- TENA Slip: Available in Small through to Super Large. TENA Slip Plus and TENA Slip Maxi offer substantial overnight absorbency and are commonly used by older children and teenagers with heavier wetting or complex needs. Size Small typically fits a hip measurement of 60–90 cm.
- MoliCare Slip: Similar range to TENA Slip. Available in Mini, Small, Medium, Large, and Extra Large. Their Slip Maxi range is among the highest absorbency products available outside clinical/hospital settings.
- Abena Abri-Form: Frequently recommended in complex care settings. Available in sizes from XS to XL with multiple absorbency levels within each size.
- Attends Slip: Another specialist option with similar sizing, often available on NHS prescription for those who qualify.
Because taped products have resizable fastening tabs, they offer more flexibility at the fit stage than pull-ups. This makes them a useful option for children with variable weight or atypical body proportions.
Sizing Guide by Age and Approximate Weight
The following is a general guide only. Fit should always be verified against the individual product’s hip and waist measurements.
- Age 4–5 (approx. 15–20 kg): DryNites 4–7, Pampers Size 6–7, or equivalent pull-up. If weight is at the upper end, check hip measurement against DryNites 8–15.
- Age 6–8 (approx. 20–30 kg): DryNites 4–7 or 8–15 depending on build. For higher absorbency, TENA Slip Small or MoliCare Slip Small.
- Age 9–11 (approx. 28–45 kg): DryNites 8–15. For heavier wetting, TENA Pants Plus in Small or TENA Slip Small. Check hip measurement — this group is most likely to fall between mainstream and specialist sizing.
- Age 12–15 (approx. 40–60 kg): DryNites 8–15 at the lighter end; TENA Pants or Abena Pants S/M for most. TENA Slip Small to Medium for taped options.
- Age 16–18 (approx. 55–80 kg): Adult continence products in Small or Medium. MoliCare Slip Medium, TENA Slip Medium, or equivalent.
Weight ranges are approximate and based on typical developmental growth charts. Children with complex needs, physical disabilities, or atypical body composition may require professional assessment. A continence nurse or paediatric continence adviser can provide specific product recommendations and, in some cases, access to NHS-funded supply.
How to Measure for the Right Fit
Take three measurements before ordering:
- Waist: At the natural waistline, with the tape snug but not tight.
- Hips: At the widest point, usually level with the top of the thighs.
- Thigh circumference: At the fullest point of the upper thigh. This is particularly important for leg-cuff fit.
Cross-reference all three against the specific product’s sizing table. Mainstream products (DryNites, TENA) publish these online. If any measurement falls into the next size up, go to the larger size — especially for overnight use where movement during sleep puts additional strain on seals.
For ASD and sensory-sensitive children, consider requesting samples before committing to a bulk order. Several specialist suppliers offer sample packs, and some NHS continence services will provide trial quantities. The material feel, noise level, and bulk of a product are legitimate selection criteria — not preferences to be overridden.
Booster Pads: Extending Capacity Without Changing Size
If you’ve found a product that fits well but isn’t quite absorbing enough, a booster pad inserted inside the existing product can extend capacity without requiring a size change. Booster pads are widely available from specialist suppliers and add absorbency at the point needed most — particularly useful for heavier overnight wetting. They don’t change the external dimensions of the product significantly, which matters for comfort and discretion.
When to Seek Professional Advice on Products
If your child is over five, wetting most nights, and mainstream products aren’t containing it adequately, it’s worth speaking to your GP about a referral to a paediatric continence service. This isn’t just about clinical treatment — continence nurses can assess product needs directly, advise on sizing, and help access products via NHS prescription where a child qualifies.
If you’ve been to a clinic and found the support lacking, or if your GP has been dismissive, see The GP Dismissed Our Bedwetting Concern: What Parents Can Do When They Are Not Heard for practical next steps.
For context on what’s developmentally typical and when investigation is warranted, Bedwetting by Age: What’s Normal, What’s Not, and What to Do covers this clearly without unnecessary alarm.
Finding the Right Product Takes Iteration — That’s Normal
No single nappy size guide for older children will give you a definitive answer on the first try. Fit is individual, wetting volume varies, and sleep position affects where leaks occur. If you’re hitting consistent leaks in the same location, Front Leaks vs Back Leaks vs Leg Leaks explains what each pattern usually indicates — and that can point you toward a more targeted solution faster than trial and error alone.
The goal is reliable overnight protection, good sleep, and a child who wakes up comfortable. Whatever product achieves that — pull-up, taped brief, or boosted mainstream option — is the right choice. Use the sizing information above as your starting point, measure carefully, and request samples where you can before committing to a full pack.