I'm not sure if they are on topic (I think they fit criteria) or on sale at the moment, but if you are looking for a realistic baby bjd, the best I can think of is Collection Call Me Doll's baby Yuta and Yan dolls. They are 13cm, and are super close to a human looking baby. Now, that might be too close, but hey, I didn't see them mentioned so I thought I'd pop in.
Probably suuuuuper late, but dream valley ding is super baby like and also very small! Perfect, for sure
