About 744 €/month, every month, for eighteen years.
The shape of 18 years
A child is not one expense. It is a curve.
Monthly outflow per year of the child's age. Direct cash in cyan; childcare in violet, concentrated in the first years. The teen years rise quietly but never spike like the early ones.
Direct cashSource: Save the Children España - El coste de la crianza en 2024 (Tabla 2)
What it could have been
The same money, invested instead.
If you set aside 744 €/month in a globally diversified portfolio at a 6% real return, after 18 years you would hold roughly:
288.341 €
At 6% real return · 160.788 € contributed, 127.553 € from compounding
About 1.8× the direct cost.
This is the opportunity cost in plain numbers. It is not an argument against children. It is the size of the choice you are making, so you can plan around it: a savings goal, an 18-year compounding account in the child's name, or simply a clearer head.
For scale
What else costs about 160.788 €?
A down payment on a home · 80.000 €2.0×
A luxury car · 95.000 €1.7×
Seed capital for a small business · 200.000 €0.8×
Ten years of rent in a major city · 200.000 €0.8×
A full K-12 private school education · 250.000 €0.6×
Where the monthly cost goes
One child, one school month, eight buckets.
Monthly direct cash for one child, broken down by the cost table. Housing share and food dominate; phone and internet round to zero because they are typically already on the household plan.
Food165 €
Hygiene19 €
Clothing52 €
Education & childcare141 €
Leisure & toys31 €
Healthcare6 €
Furniture9 €
Housing share92 €
Housing utilities42 €
Transport13 €
Childcare & conciliation129 €
Extraordinary expenses113 €
See all scenarios at once
1 child
160.788 €
160.788 €
2 children
321.576 €
321.576 €
3 children
482.364 €
482.364 €
Partner spotlight · True WealthPartner link
Open an account in the child's name.
Setting aside 10% of the child's costs is 74 €/month. Open an account in the child's name and turn the 18-year horizon into the longest compounding window you'll ever have. True Wealth invests it on autopilot: globally diversified ETFs, automatic rebalancing, no stock picks.