Nappies, changing and the rash nobody avoids

New parents examine nappy contents with an attention they would have found inconceivable a month earlier, which is appropriate — in the early weeks it is the most accessible indicator of whether feeding is working.

What the output tells you

In the first days, wet nappies increase roughly in line with the day of life, reaching six or more heavy wet nappies daily by around day five and continuing at that rate.

Urine should be pale; concentrated dark urine suggests inadequate intake.

Brick dust staining — orange or pink urate crystals — is common in the first days and should resolve as intake increases; persisting beyond day three warrants a feeding review.

Stools progress from meconium, which is black, sticky and tar-like, through a greenish transitional stage, to yellow by around day four or five.

Breastfed stools are typically mustard yellow, loose and seedy; formula-fed stools are firmer, paler and stronger smelling.

Frequency varies enormously: several a day is normal, and after around six weeks some breastfed babies go many days between stools, which is normal provided the stool is soft when it comes and the baby is content.

Stools that need attention

White, chalky or pale stools, which may indicate a liver or biliary problem and require prompt assessment.

Blood in the stool, which may indicate a fissure, allergy or infection.

Persistent mucus.

Black stools after the meconium stage.

Watery, frequent stools with signs of dehydration.

And a red jelly-like stool with severe intermittent pain, which is an emergency.

Changing practicalities

Change frequently, since the skin is damaged by prolonged contact with urine and stool.

Clean gently with water and cotton wool or a fragrance-free wipe, front to back in girls.

Do not retract the foreskin in boys — it is normally adherent and retracting it causes damage.

Dry thoroughly, including the creases.

Allow nappy-free time.

Have everything ready before you start, and never leave a baby on a raised changing surface unattended.

Changing on the floor is safer than a table, particularly once rolling begins.

Nappy rash

Nearly universal at some point and usually straightforward.

Simple irritant dermatitis: red, sore skin on the areas in contact with the nappy, typically sparing the skin folds.

Treatment: frequent changing, gentle cleaning, thorough drying, nappy-free time, and a thin layer of a barrier preparation.

Thicker is not better, since a heavy layer prevents the nappy absorbing.

Most improves within a few days.

When it is not simple

Distinguishing features worth recognising.

Candida, where the rash is bright red, involves the skin folds, has a defined edge and satellite spots beyond the main area.

It needs an antifungal preparation, and thrush in the mouth frequently accompanies it.

Bacterial infection, with pustules, weeping, crusting or the baby being unwell, requiring assessment.

Seborrhoeic dermatitis, greasy and involving the folds, frequently with cradle cap elsewhere.

Eczema, which usually affects other areas too.

Allergic contact dermatitis from a product, which follows the pattern of what was applied.

And any rash that is severe, blistering, ulcerated, or not improving after a few days of good basic care, which should be seen.

Nappy choices

Practically rather than ideologically.

Disposables are convenient and generally more absorbent, which keeps skin drier.

Reusables cost less over time, generate less waste, and require washing at appropriate temperatures and more frequent changing since they hold moisture against the skin.

Environmental comparisons are genuinely complex, with disposables generating waste and reusables consuming water and energy, and the difference narrowing depending on washing practices.

Whichever is used, fit matters: too tight causes marks and chafing, too loose leaks.

Fragranced products, including some wipes, are a common cause of irritation and are worth eliminating if there is persistent rash.

The nappy area in general

Findings that worry parents unnecessarily.

Swollen genitals in the first days, from maternal hormones.

Small amount of vaginal discharge or bleeding in girls in the first week, also hormonal.

Undescended testes, which should be checked and which frequently descend in the first months, with review if not.

Hydrocele, a fluid swelling around the testis, which usually resolves.

Adhesions of the foreskin, which are normal and resolve over years.

And findings that do need review: a swelling in the groin that comes and goes, which may be a hernia and needs assessment, and a hard tender irreducible swelling, which is an emergency.

Moving out of nappies

Much later than this article's readership, and worth flagging.

Readiness signs rather than an age: staying dry for periods, showing awareness of going, being able to follow simple instructions, and interest.

Pushing before readiness prolongs the process.

Which is worth knowing early, because the pressure to start begins long before the child is ready.

General information only, not medical advice. Consult a health visitor or clinician about persistent nappy rash, pale stools, blood in stools or a groin swelling.