Disney Tickets for an infant

[THOR1]

Sorry about this

I know that you dont need them for under 3's but something spooked me

I am buying tickets for our son and daughter in law on the US site - 1 day only, their wee boy is too small for anything else but his mum would like him to go to MK

So I put the 2 adult tickets in the cart and it asks me to provide guest details

Again no problem

But what spooked me was that in the age range drop-down box one of the options was an infant.

This led me to wonder whether although I wouldn't be buying him a ticket I should provide his details?

I couldn't see any place to do so?

Thanks