Great. Travelling to the United States from western europe (and other countries that are part of the Visa Waiver Programme) just got made more complicated and more of a hassle than it already is. Brace yourselves for horror stories starting in August...
Note too that toddlers will also have to register online 72 hours before boarding their plane:
Accompanied and unaccompanied children, regardless of age, will be required to obtain an independent ESTA authorization and determination of eligibility.
True, you only need do this once (they say now) every two years, but still... Tedious.