Our LO came to us age 9 months and we waited 6 months to see FC's, we probably would have been ready at 5 months in but due to holidays etc it was 6 months.
We didn't feel ready, and I'm not sure that LO would have coped sooner, that's just our personal experience. We felt it would have been unsettling and confusing rather than reassuring for LO. We also had FC's children to consider and mutually felt it would be better for them to see LO more settled when we met up.
I suffered PND and honestly think I couldn't have coped with a meet up any sooner, was very fearful that LO would reject me and want FC.
This may sound very selfish but ultimately it had to be the right time for all of us in order to benefit LO long term.
We met for a couple of hours at a quiet mid way point, had a walk and picnic. It went really well, since then we've met up two more times (in a year), we look forward to seeing them and FC children find it easier (less upsetting). I hope we'll continue to meet up 2-3 times a year.
We've taken some lovely photos for LO to treasure, and we hope that by having FC's in her life it will make talking about adoption easier.
Go with your gut feeling