You can request a child seat as an 'optional extra' during the online booking process. If you already have a booking, go to the Manage Booking section of our website. Use the 'Jump to' section and select 'Extras', then select the specific child seat you want from the Extras section. If you don't get the option to add a child seat, we recommend that you contact the rental company directly to address this.
Many airlines will allow you to bring child seats with you for free, so it could be worth looking into bringing your own child seat if you wish to avoid the cost of renting one.