Note that this guide is not a walkthrough, nor a tutorial as to how to achieve these combinations, just merely an updated list of all baby bun combinations for version 1.0.9 of the game, generated with the game's built in export tool. For an actual guide for those, check the other already existing steam guides out there.

In specific, these two here:
All Home Captures & Babies
All Baby Bunny Solutions 全兔宝宝配对攻略

Additionally, this list may or may not still be incomplete, so any new discoveries that are not on this list would be appreciated in the comments.
Oh and, before it gets brought up, these two bun combinations here in specific do not seem to be possible anymore as of v1.0.9:
S-3-1 x E-4-1
C-3-1 x E-4-1

These may still appear in older compiled lists of all combinations, so be aware.

With that in mind, here's the list:
wow look at me I did a "100%"[pastebin.com]

-and here's a useful tool I personally used to compare my list to the one out there to clean up the few remaining combinations I missed:
List Comparison Tool[www.listdiff.com]

That's all, thanks for reading.