How much do cloth nappies cost for a second child if you already have a stash?

What is already paid for when the stash exists?

The expensive line on child one — the nappies themselves — does not repeat if the same stash still fits and still holds a wash. Which? (11 February 2026) says reusables work out cheaper in the long term, particularly if you use them for more than one child, and quotes a typical life of two to four years or 400 to 500 washes. WRAP (4 March 2015) said savings grow if nappies are reused on later children. Those are directional official notes, not a second-child price list.

How do I tot up a second-child cloth bill?

Stay on incremental cash — what leaves the account because baby two exists — not a replay of child one's kit. This is not a council-voucher walkthrough and not a nappy-hire page.

1. 1
   Photograph what you still have Count dry nappies, wraps and inserts. Which? puts a full-time set around 15 to 25. If two children will overlap in nappies, you may want a few extras — a 2016 Nappy Lady sibling note suggested about half as many again rather than a second full set. Treat that as a logistics hint from a retailer, not an official quota.
2. 2
   Mark what has worn out Which? says elastics, Velcro and the plastic layer of waterproof covers are the parts that go first. Price only the replacements you will actually buy. Line-drying, Which? notes, helps the stash last toward the top of the two-to-four-year band.
3. 3
   Decide whether a tiny newborn add-on is needed Onesize or birth-to-potty nappies can still be bulky on a small baby. A handful of newborn wraps or prefolds is an incremental buy. A second 20-nappy kit is not required by any official source.
4. 4
   Price the laundry with the bill in front of you Same formula as child one: washes × labelled kWh × unit rate, plus metered water and detergent. If both children are in nappies at once, the bucket fills faster and you may wash more often — that is more cycles, not a higher official pence-per-wash.
5. 5
   Stop at incremental cash Do not add the original kit again. Do not fold in a hire catalogue or a local voucher scheme on this page.

What usually needs replacing before a sibling uses the stash?

Which? (February 2026) lists the first failures as leg elastic, Velcro and cracking on waterproof covers. Sun-drying can fade stains; fabric softener is one of the things Which? says to avoid if you want the stash to last. None of that is a safety verdict — it is wear.

• Wraps / PUL covers — often the cheapest incremental buy if the inner nappies are still absorbent.
• Elastics — some parents refit them; others retire that nappy. Either way the cash is a few covers, not a new stash.
• Fastenings — hook-and-loop pills; poppers last longer in Which?'s wear note.
• Newborn-specific bits — only if the existing rise still swims. NHS change rates are highest in the early weeks (10 to 12 a day), so fit matters more than buying another 20 nappies.

A May 2023 Nappy Lady one-child versus two-child table (page updated 1 June 2025) put a £100 terry kit at £348 for one child and £564 for two. The extra £216 on that dated retailer sheet is laundry and sundries, not a second kit. Recalculate laundry at today's Ofgem rate rather than their May 2023 33p/kWh.

Does overlapping two children in cloth double the wash bill?

Only if you double the number of cycles. Two children in nappies fill a drum faster, so you may move from every third day to every other day. That is more washes × the same labelled kWh × the same unit rate. It is not two standing charges — the standing charge is on the home already.

Worked electricity example only: moving from 122 washes/year (every third day) to 183 (every other day) at 0.85 kWh and 26.32p/kWh is about £27 versus £41 of electricity in a year. Metered Thames Water at 70 litres adds about 29p a wash at 2026–27 volumetric rates. Unmetered homes skip that line.

A retailer sibling article from 2016 suggested washing at 60°C while two children share nappies. That is their hygiene advice, not an NHS or Ofgem rule. A 60°C cycle uses more kWh than Eco 40–60 on the same machine — read both numbers on your label or manual before you treat 60°C as free.

How does a second cloth child compare with buying disposables again?

Child two on disposables is another full pack run. NHS Best Start cites around 4,500 changes before potty training. MoneyHelper's 2024 leading-brand line, via Which?, was £1,000 over 2.5 years for one child — so a second disposable child is in that order of magnitude again, at whatever pack prices you face now.

Child two on an existing stash is laundry + replacements. Against supermarket own-brand the cash gap is smaller than against leading brands; against Aldi Mamia it can be months rather than a large save. The incremental cloth bill is still the fair comparison, because the kit is a sunk cost.

In shortIf the stash still fits, child two is washes × labelled kWh × the Ofgem (or bill) rate, plus the wraps you actually replace. Which? and WRAP both flag the second child as the point where reusables look cheaper. They do not publish a 2026 sibling tariff.

What should I not fold into this second-child total?

• The original kit, unless you are replacing it wholesale.
• Council nappy vouchers or hire catalogues — different pages.
• Australian dollar laundry examples.
• A claim that every household with a stash spends the same on child two.