Exactly that’s the ETF I invest in for my child. My motivation for picking that specific ETF covering only USA with the S&P500 is because of the very low TER (0.07%) on 18+ years investments makes quite a difference and it is on the list of free ETFs you can get at DEGIRO (https://www.degiro.ch/data/pdf/ch-en/Free_ETFs.pdf).
Alternatively VWRL which covers the whole world is a great choice but you might already have it for yourself and its TER is 0.22% (still cheap but compared to VUSA it’s 3x more).
Note that VWRL (distributing) is not on the list of free ETFs at DEGIRO but the accumulating version is. That one has for ticker VWCE. Finally because these ETFs are in USD you still have to pay the conversion fee from CHF to USD, currency exchange is unfortunately not for free