For a newborn, budget for 8–12 nappies (diapers) a day — which works out at roughly 200–300 for the first month. The safest approach is to buy one large pack of newborn size plus a smaller pack of size 1, then top up as you learn your baby’s pattern. You will change a nappy at nearly every feed in the early weeks, and running out at midnight with a screaming infant is a rite of passage best avoided.
The daily maths
Newborns feed every two to three hours, and what goes in must come out — usually within minutes. In the first fortnight, 10–12 changes a day is completely normal; it settles to around 8–10 as their digestion matures. The NHS advises changing nappies as soon as they are wet or soiled to protect delicate skin, so this is one area where scrimping causes nappy rash rather than savings.
A quick way to think about it:
- Week 1–2: 10–12 per day (70–84 per week)
- Week 3–4: 8–10 per day (56–70 per week)
- First month total: around 250–300 nappies
Babies also have a talent for needing a fresh nappy thirty seconds after you have fastened the last one. Build a 10% buffer into every estimate and you will not go far wrong.
Your first-month shopping list
Walk into any Boots or Tesco and the nappy aisle is overwhelming. Keep it simple:
- Newborn size (up to 5kg): one jumbo pack of 60–90, to start. Most babies wear newborn size for 2–4 weeks.
- Size 1 (4–6kg): one pack of 40–60, ready for the switch. Bigger babies skip newborn entirely — if scans suggest a 9-pounder, lean towards size 1.
- Wipes: water-based, fragrance-free wipes (or just cotton wool and warm water, which midwives often recommend for the first weeks).
- Barrier cream: a tube of zinc-based cream for redness.
- Nappy bags: for changes away from home.
- A changing caddy: keeps everything within arm’s reach at 3am.
Do not bulk-buy six months’ worth before the birth. Babies grow at wildly different rates, and some develop sensitivities to particular brands. Buy modestly, discover what suits your baby, then subscribe or bulk-buy your winner — most UK supermarkets and Amazon offer subscription discounts of 10–20%.
Newborn vs size 1: when to size up
Size labels overlap deliberately (newborn to 5kg, size 1 from 4kg), so go by fit, not the calendar. Size up when you see red marks around the thighs or waist, frequent leaks up the back, or the tabs straining to meet in the middle. A nappy that is slightly too big leaks less than one that is slightly too small — counterintuitive, but true.
Your health visitor or midwife will weigh the baby regularly in the early weeks, which gives you a handy steer on sizing. If in doubt between two sizes at the shops, take the larger.
Night changes without the drama
You do not need to change a merely wet nappy at every night feed once the baby is past the first couple of weeks — modern nappies wick moisture well, and an undisturbed baby sleeps longer. Do change soiled nappies promptly, day or night. Keep the lights low, skip the chat, and have everything pre-staged; the goal is feed, change, back to sleep with minimal stimulation for everyone.
Disposables vs reusables
Cloth or reusable nappies have come a long way from terry squares and safety pins — modern all-in-ones go on much like a disposable. A full set costs roughly £200–£400 upfront but can save £500+ over the nappy years, and several UK councils offer real nappy incentive schemes (vouchers or cashback) to encourage them. They do mean extra washing — around 2–3 extra loads a week.
Many parents compromise: reusables at home, disposables for nights and outings. There is no moral exam here — the best nappy is the one that keeps your baby comfortable and your sanity intact.
Dealing with nappy rash
Even with diligent changing, most babies get nappy rash at some point — it is rarely a sign you are doing anything wrong. The usual culprits are prolonged dampness, friction, or a reaction to a new wipe or detergent. Treat it by changing more frequently for a few days, cleaning gently with water rather than wipes, patting (not rubbing) dry, and applying a thick layer of barrier cream at every change.
Give the skin some air whenever you can: ten minutes of nappy-free time on a waterproof mat after a change works wonders. If the rash is blistered, bleeding, does not improve within a few days, or your baby has a temperature alongside it, speak to your GP or health visitor — occasionally what looks like nappy rash is thrush or eczema needing different treatment.
As they grow: routines matter
The nappy stage flies by faster than the sleep deprivation suggests. Before long you will be trading changing tables for potties and teaching your little one to manage their own routines — our guide on how to teach kids self care picks up where this one leaves off. And if the identity shift of new parenthood feels bigger than expected, you are not alone; read how to move on from your old routines with kindness rather than guilt.
Frequently asked questions
How many nappies does a newborn use in 24 hours?
Expect 8–12 changes in 24 hours for a newborn under one month old. It sounds like a lot, but newborns feed round the clock and have tiny bladders — frequent changing is simply how the first weeks work.
Should I stock up on newborn size before the birth?
Buy one large pack, not a warehouse. Around a third of babies outgrow newborn size within two weeks, and larger babies skip it altogether. One pack of newborn plus one of size 1 covers every scenario.
How do I know when to move up a nappy size?
Red marks on the skin, leaks (especially up the back), the nappy riding low, or tabs that barely fasten all signal it is time. When between sizes, size up — a slightly big nappy leaks less than a slightly small one.
Are expensive nappies worth it?
Not necessarily. Fit matters far more than brand prestige, and every baby’s shape suits different cuts. Buy small packs of two or three brands, run a week-long trial, then commit to the winner.
How should I store nappies?
Somewhere cool and dry — a damp garage degrades the absorbent gel. Kept properly, unopened nappies last two to three years, so leftover packs from a first baby are fine for the second.
