Could you please provide me with where you found this information? I ask, because it contradicts what I have found. Specifically, that the reason there are not bregmas listed on the online PND 14 atlas is that multiple animals were used in the making of the atlas. As multiple animals, all with different bregmas, were used, it was not possible to accurately have bregma identifiers on the atlas (Why doesn't the 3D Mouse Brain Atlas have Bregma coordinates?). Which leads to my original question - multiple animals with multiple bregmas, each contributing sections to the atlas - how distinct are sequential sections?
With regards to brain size - I am looking for a general range of the average developing mouse brain, in order to compare it to the average size of the adult mouse brain.