Fostering w/ bio toddler

Hi! My husband and I are interested in fostering/foster to adopt/adopting available children! We plan on possibly starting the process this fall. One of our main concerns is that we have one bio daughter who will be around two years old by that time. I know a lot of the kiddos that are in foster care or who are available are around 8 years old. We are 100% okay with any kids under 12, but I didn’t know if anyone had experiences with having older foster kids and younger bio kids. I have read quite a few things about how messing with birth order can have some negative consequences, but I wasn’t sure it would necessarily apply here since my daughter is so young. If anyone has any insight please let me know! I just want to do what’s best for everyone, especially the kids! Thank you!!!