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Leaving money in the bank is not investing. Also, compare interest rate with inflation, you’re probably throwing away money every year. Meanwhile, your bank is actually investing your money and beating inflation. They pay you the interest and keep the rest.

Those accounts should be in something that pays more interest because you give up the liquidity. You pay (in reduced interest rates) for the ability to withdraw at any time. You can instead be completely risk free and make more money* by promising not to need it for another 10, 14 or 18 years.

* However many of those methods involve locking in the interest rate, so you might miss out if banks start paying 10% like they did decades ago.

> set up bank accounts for our kids

yes

> so that they could accumulate interest over 18 years

at 1% ... no ... the value of that money will so eroded by 18 years of time - a better investment would be in some good memories with them; go to europe and see the Sistine Chapel or teach them to surf / play tennis.