You can also pick up child seats that are bus specific as well. Did so for my 2 year old daughter. Works perfect in my bus unlike the regular car seats we have as well for the other vehicles.
2002 E450 Thomas/ U-JOINT 4X4, family hauler
1954 Crown 35 foot RV conversion, guest house
1945? City Bus (unknown manufacture), yard art
1940s 'Binder 7 window, man cave