these were done by an artist named Aogami. he mostly does furry stuff. but you can find AR stuff here and there. i know there is another group of pictures involving a dragon girl and a mouse girl being ARed to pre-birth.
i've actually commissioned him to do a rather long animation involving Age Regression that includes shrinking out of clothes and a toddler getting diapered. i'm already in $1200 (yes he is expensive but works hard)
his websight can be found here.https://inkbunny.net/Aogami