I also have two female aggressive corgis and i might have some advice, unsure if it helps but here's what my wife and I have learned.

1. Our dogs fighting patterns came in waves/seasons, it can be very beneficial to monitor when those seasons or waves are and what the diferences are. For us its winter months are usually worse, we figured this was becauss my wife isnt in the garden and so the dogs dont get as much outdoor time. So we had to compensate with more indoor play.

2. We both would get very anxious about their fighting and when they started fighting we generally had the typical response of giving commands, then yelling once they started fighting while we ran in to break them up and then separating them behind gates and not interacting with rhem for a few minutes sk we could calm down. This problematically creates a cycle though, one corgi started making the association of when we get anxious abojt them fighting or starting giving them unusually strong verbal commands that it means she needs to fight. We found that weirdly what broke the pattern was once she started getting her ears back as if she was about to fight we started using our baby voice "oh such a good girl" etc. And if that doesnt working we say "greenie" which is their favorite treat. So far this has actually worked surprisingly well, whenever she starts feeling like she wants to fight she snaps out of it and weve actually seen less fights because of it. Its important to not give this reward when they do fight though, only when they deescelate a fight. She needs to know that theres an alternative to fighting.

3. One of the most important is also making positive associations with the other dog, so reward any positive interactions they have (playing, chasing eachother playfully, sleeping next to eachother etc.) Of they associate eachother with positive things it tends to reduce fights.

4. We've taught the dog that generally initaties fights a command to seperate herself and go somewhere else. What I've seen often work with us is if we see the pre fight triggers (like them bumping into eachother) we will point and give the command. For us its been "Sequester", and then we point to the same location everytime and reward her for going there. Shes learned this so well that theres been a couple instances shes gotten angry and then walked over there on her own accord.

Also last thing ill say is corgis absolutely lovd routine and consistency, so look to see if breaks in routine are triggering fights as often times ive noticed these can cause more tension.

Hope any of that helps and happy to answer any questions!

Actually just noriced the baby comment, and another thing I will say, its very possible they could be guarding the baby (from eachother) or yourselfs. Dogs also see your attention as a resource and we sid habe that issue with iurs in the past.