About kids, I don’t see that NOT accepting children is discrimination. It is a personal choice that can be negotiated with. eg I’ve accepted a toddler when the child was with 3 adults and I refused a booking that had 4 adults, 3 toddlers and 2 infants…
Anyway, Airbnb have this to say if you are putting child friendly on your listing:
"Airbnb has partnered with Safe Kids Worldwide, a global organisation dedicated to preventing child injuries. Safe Kids Worldwide suggests adding the following amenities to make your home infant- and child-friendly:
A working smoke and CO detector on every floor, and in all sleeping areas.
A portable crib with a firm fitting crib sheet. Be sure to place away from windows and blinds in room.
Removable safety gates for stairs and, if you have a pool, a gate around it.
Cordless window blinds.
Keep all household cleaning products, liquid laundry packets, medicine, and chemicals securely stored and out of reach.
Mounted flat panel TVs to avoid tipovers. Be sure to place heavier, box-style TVs on low, stable pieces of furniture. Use brackets, braces, or walls traps to secure unstable and top heavy furniture to avoid tip overs.
Water heater set at no higher than 120 degrees Fahrenheit to avoid scalds."