I hear a lot about the energy efficiency of animal brains in comparison to e.g. GPUs. However, as far as I can tell most of the numbers reported are for adult b

I hear a lot about the energy efficiency of animal brains in comparison to e.g. GPUs. However, as far as I can tell most of the numbers reported are for adult brains, which effectively have been sparsified over time. Does anyone know of how the picture changes if we consider baby animal brains, which as I understand it have much denser connectivity and higher energy consumption than adult brains?