Air France and KLM have expanded Flying Blue Platinum member complimentary lounge access to include all kids.
Platinum members can guest an unlimited number of children under 18 years if they are on the same flight(s) + 1 additional guest.
You can access Flying Blue’s page for elite benefits here.
Flying Blue Email:
Gold and Platinum members benefit from free access to lounges when travelling on the same day on an international flight operated by Air France, KLM, China Southern Airways or a SkyTeam partner (including connections to/from an international SkyTeam partner flight). Platinum members can bring 1 guest (adult or child) and all their children under 18 into the Air France and KLM Lounges for free if they are on the same flight. Gold members can bring 1 guest (adult or child) into the Air France and KLM lounges for free if they are on the same flight.
In addition to general lounge access benefits, Gold and Platinum members get free access to KLM Lounges when traveling on an international flight marketed as KLM and operated by a non-SkyTeam Flying Blue partner. Platinum members can bring their children into the KLM Lounges for free if they are on the same flight and are 0-18 years old, or for a discounted rate if they are on the same flight and are 18-24 years old.
Flying Blue Elite Benefits:
This is a welcomed benefit for Flying Blue Platinum members with kids under 18. Now they can bring the entire family into the KLM and Air France lounges.
Not sure what exactly is required to prove family status?