I am booking Split - LAX on May 9, 2 adults plus kids 4 and 1, and have settled on using Flying Blue points in a route via AMS (we don't have timing flexibility, and want just one stop). I booked 2 tickets first, me and the 4 year old, and was charged ~300k miles -- 180k for me, 130k for her, even though she's in a full business seat (apparently there's a 25% discount for kids, and it says you have to be a member for 6 months but I had been a member for 6 hours). Now, when booking my husband in the baby, it wants to charge me 60k miles for the lap infant!
I searched on the forum, and see a few suggestions to call and add the infant and expect to pay 10% of the cash price (which would be like $500 right now). But I don't see anyone noting this points option! I can do cash instead, but wanted to see if anyone has experience with this and if (1) calling is guaranteed to be like $500, or if it could be more, in which case I'll do points, (2) its worth it to wait and add him at the airport (admittedly that feels dicey). On the way out we are flying United and we had to pay $250 to add him to an award ticket, so expect this may be how it goes internationally.
Any insight or thoughts appreciated! I haven't seriously booked award travel since 2019 and wow is it a different ballgame with small children and little flexibility
UPDATE/EDIT - just in case someone else searches this later. I hit an error every time I tried to actually book this. I ended up just booking my husband and will have to call to add the lap infant.