Children Cost Most at Both Ends:
the two peaks, and what sits in the gap

The cost of a child is not spread evenly

Raising a child to 18 is usually quoted as one total — commonly a little over $300,000 for a middle-income family.¹ Divided by eighteen, that is about $17,000 a year, and nobody's life looks like that.

The cost arrives in two peaks with a gap between them, and the gap is where retirement saving is supposed to happen.

What the first five years cost

The first five years average $29,325 a year — roughly 75% above the average annual cost across the whole eighteen.²

Childcare is most of it. Infant daycare averaged $17,264 a year in 2026, up nearly 50% since 2023.² And money alone does not always buy it: an estimated 46% of under-6s live in a childcare desert, where the places do not exist at any price.²

The timing is the problem. This peak lands in the years when earnings are lowest, because careers have had the least time to compound.

One calculation to get right. When a parent considers reducing work, the comparison is not monthly pay against monthly childcare. It is lifetime earnings, progression and retirement contributions against a few years of fees. A break of three years is not three years of salary — it is those years plus a permanently lower base for every year after, plus the retirement contributions that were a percentage of it.

What the teenage years cost

Then it comes back. The teen years run over $20,000 a year.³ Some specific lines, because the total hides them:

The insurance line is the one most families do not see coming, because it is a single policy change that adds more than most annual raises.

And this peak arrives with company. Parents in this stage carry the highest monthly mortgage costs of any age group, and many are helping their own parents at the same time. Average annual household spending for that group was $95,692.⁴ Around 69% report moderate to extreme stress, with money central for 43%.⁴

The gap in the middle is where retirement saving is supposed to fit

Put the two peaks together and the shape is clear. Expensive in infancy. Cheaper in the middle school years. Expensive again through adolescence, college, and often a parent's care at the same time.

Standard advice puts serious retirement saving in the middle stretch, and catch-up contributions in the years after 50 — which is the second peak.

That is worth saying plainly, because the usual framing treats a thin retirement balance in these years as a discipline problem. It is at least as much a timing problem. The costs and the saving window are competing for the same years by design.

What follows from the shape

• Fund retirement before college. You can borrow for a degree. Nobody lends for

retirement. 529s and College Costs: the 2 questions to answer before funding one covers the accounts; Can't Pay Everything? which bill goes first covers the sequence.

• Expect the second peak, and price it before it arrives. The car insurance change, the

food line and the phone plan are all knowable a year ahead.

• Treat the middle years as the window they are. It is the only stretch where both

peaks are off the books, and it is short.

• Price a career break over a lifetime, not a month.
• Know what you are already giving. Support flowing up to parents and down to adult

children is the least tracked money in most households — Lending Money to Family, and Getting It Back and Family Money: what documents transfer, and what only practice can.

What the children in the second peak already know

Teenagers in these households are not unaware of it. In one survey, 42% said they were terrified they would not have enough money for what they need, 63% said their family had gone without because of rising prices, and 70% worried about affording higher education. Fewer than half felt financially prepared for college or a career.⁵

Money stress in a household is not invisible to the people in it who are not paying the bills. 45% Think Everyone Else Understands Money Better: how to find out where you stand covers what that belief does later.

The short version

The cost of a child is quoted as one total and arrives as two peaks. The first five years run about $29,325 a year, roughly 75% above the eighteen-year average, driven by infant daycare at $17,264 and landing when earnings are lowest. The teenage years run over $20,000 a year, with a single insurance change adding about $3,594, and they often coincide with peak mortgage costs and a parent needing care. Retirement saving is supposed to happen in the gap between the two, and catch-up contributions are supposed to happen during the second peak. A thin balance in those years is a timing problem at least as much as a discipline problem — and the middle stretch, being the only clear window, is worth using deliberately.