I have the same issue. There are two non-player families in my Cahaya save with newborns who aren’t on the family list and will not age past newborn. These families have had other newborns who are properly aging and included in the family list.
Thanks for sharing the file, @shamani3078. However, to check the issue properly, it would be helpful if you could send us a zipped copy of the entire folder that contains the save file.
Sorry for the extra trouble, but we’d appreciate it if you could share it that way.
As of today, one of the newborns actually changed to a toddler (it’s been a newborn since I started this save around 10/1), but it still doesn’t appear on the family list.
As well as another newborn in another family (stuck as a newborn) that is also not on the family list.