I'm looking at rooms at booking.com and regarding the price to add one extra child they often write something like: All children under two years old stay free of charge for childrens cots/cribs.
I'm not a native english speaker, but my understanding of "under two years old" is only applicable when the child is 0 or 1, but I called booking.com and they confirmed for one sample hotel that it is fact when the child is two years old.
So can I assume that generally when they write under two years that a two year old can stay free of charge?
The examples are from hotels in Kenya if that makes any difference.

