Guests are bringing an infant but have stated that the child is 4 years old. Can I charge extra?

[Crimble0]

I have received a trip request from a couple wishing to bring their 4 yr old to stay in my 1 bed Airbnb barn.  This isn’t a problem but they have selected ‘2 guests and 1 infant’ in their party.  I usually make a small additional charge for a third/fourth guest (including children).  My understanding is that an infant is under 2?  Do I ask them to change their guest info and make a charge or just suck it up?

[Anonymous]

@Crimble0  I'm not a fan of the "infants stay free" policy, and this is a great example of why Airbnb really should kill it. But it is what it is. In the booking process, it's really obvious and explicit that "infant" is under 2 and "child" is 2-12. You can't possibly miss it. 

It would be totally reasonable to ask the guests to revise their request and pay the appropriate fee. If they aren't agreeable to that, they will have outed themselves as cheapskates who would have been terrible guests anyway, so declining them would be a bullet dodged.

[Kelly149]

I will host children and/or infants... but I will not host sneaky cheaters. These people would be declined at my barn @Crimble0 

[Crimble0]

Thank you @Anonymous and @Kelly149 .  I went back to the guest and they have amended and apologised - happy days!