having all the skills, memory and mind of a fully mature person trapped in the body of a baby

Trapped?

I'd not be able to contain myself, and would speak, and ambulate, immediately... wowing people to such a spectacle... a talking dancing baby, who can espouse advanced philosophical notions, challenge people to reflect on their epistemology, and even warn of crooked ploys put upon the world. ... Oh dear... I did not want to become a religious icon.

I'm presuming the baby continues to grow up normally, and is not an eternal baby-body prison... and that "all the skills" includes psyche-motor skills. ... And best of both worlds, able to learn like a baby too, vividly retaining near everything, contrast to old-man brain (where decades of toxin accumulation and stress have impaired neurogenesis and learning capacity).