Stay dry lining or cotton inner on pocket nappies: what changes?

What is a stay-dry lining, and what is a cotton inner?

On a pocket nappy the inner is the fabric that touches the baby. The insert lives behind it, in the pouch. The UK Nappy Network glossary splits next-to-skin layers from absorbency: washable liners in polyester fleece or suedecloth “help to keep baby feeling dry”; disposable paper-style liners “will not do much to help with dampness, they just catch the poo.”

Clean Cloth Nappies’ glossary (used here for fabric names, not as official advice) groups microfleece / suedecloth / stay-dry layer as synthetic face fabrics that wick moisture away so the skin feels less wet. A cotton (or bamboo viscose) inner is the opposite feel: it stays damp once wee has come through, which is why some carers call it stay-wet.

How does each inner feel, and how do I know it is time to change?

A stay-dry face can feel almost dry while the insert behind it is already holding wee. That is the point of wicking — and the reason new pocket users miss a change. A cotton inner feels wet sooner, which some carers use as a prompt, especially in the first weeks when they are still learning the stash.

NHS Best Start in Life does not rank linings. It says change a newborn whenever they have done a wee or poo to help prevent nappy rash — about 10–12 times a day at first, then about 6–8 — and to put a liner in a reusable nappy before you fasten it. The two-finger tummy check is about fit, not about which face fabric you bought.

• Stay-dry cue. Look at or feel the insert through the pocket opening, or watch the clock against NHS change frequency, because the face may still feel dry.
• Cotton cue. The inner feels damp. That is comfort information, not a rash diagnosis.
• Poo. Either lining needs a change. A stay-dry face does not hide solids.
• Nappy-free time. NHS newborn changing advice (main NHS nappy page) includes time without a nappy on when it is warm enough, because wearing a nappy all the time makes nappy rash more likely.

Which? says reusable nappies are no more or less likely to trigger irritation than disposables, but without the gels in disposables a build-up of wee and poo can irritate skin, so regular changes and nappy-free time matter. That is a change-frequency point, not a lining verdict.

Which inner suits which kind of change?

West London Waste’s pocket definition is a waterproof outer sewn to “some fabric, usually a soft liner,” with an opening to stuff boosters. Most UK pockets you can buy ready-made therefore arrive stay-dry. Cotton-faced pockets and fitteds exist; they are a type choice, not a fault.

Does the lining treat or prevent nappy rash?

No lining on this page is a treatment. NHS Best Start in Life: clean front to back, use barrier cream if there is already a rash, change whenever there is wee or poo, and give nappy-free time. If a rash is sore, spreading or not settling, that is an NHS / pharmacist / GP question, not a fabric swap.

UK Nappy Network’s other liner warning is about flushing: disposable liners should not be flushed even when a maker calls them flushable, because water companies pull them out and send them to landfill. That is a plumbing and waste note, not a skin note.

In shortStay-dry fleece or suedecloth wicks so the skin can feel drier while the insert works. Cotton stays wet and can tell you the pocket is used. Neither replaces NHS change frequency or nappy-free time, and neither is a rash treatment. Paper liners catch poo; they do not create a stay-dry face.