We haven't adopted yet, but have been approved 17 months ago, and throughout the process have wrestled with what would be best for our BC, so I'll be watching this thread with interest. Thanks for posting, @SlB09!
One thought from our very limited experience would be to think hard about what and when you share with your BC. I've read a lot of advice about involving existing children all throughout, but you know your child best. As our BC was only 2 yo when we started, we didn't share with them initially, and only started talking about adoption in fairly general terms later. It helps that we have good friends who foster. At some point, we were exploring a potential link with SW, and at that point, we were asked to really ramp up talking about adoption. We knew BC was likely going to get very involved emotionally, but without fully understanding timelines etc, but did as asked. We read a lot of books and started talking about it in quite concrete terms - not about the child in question, but about our family adopting. As expected, BC got very involved emotionally. Unfortunately, the link fell through. Navigating this with our BC has been hard and their disappointment cuts deep. We're still hoping for a future match, but know that we'll think extremely carefully about when to involve BC, even if it means upsetting SWs and going against perceived wisdom.
@Maggie178, I'm very impressed by you managing to go through this uncertainty as a family. Fostering a young baby in the hope to contribute to a good outcome for them, whether returning to birth parents or us adopting them, had been our initial hope, but I'm not sure our BC would have coped (they would now, being a bit older, but we're now with a LA who doesn't do these placements). So happy it worked for you!
@Italiangreyhound, interesting what you're saying about the age gap! It seems there's no right or wrong...(?)