Sorry for the double message, but as I was searching for more AR content, I came across something I also need help finding, hence this second request I make.
https://booklive.jp/product/index/title_id/307152
I came across this page listing a manga called "Unknown no Madoshou", or
Unknown(アンノウン)の魔導書 in Japanese. It seems to be a single volume collection of short stories (Which may or may not have been published in magazine form earlier), and its second story features a young girl ARed into a baby.
However, I couldn't find any images from that story yet, and the previews I came across didn't go far enough to reach it. So I'd love it if someone else who's interested in that would help me find it; or if it's not available yet, at least keep it in mind just in case. ^u^