This article assesses Bernard Stiegler's critique of infantilization. Contemporary education--and society in general--would no longer develop children into adults, but would keep them in their childish state. Stiegler's critique is explicitly inspired by Enlightenment ideals, characterized by a positive notion of maturity and a negative notion of childhood and immaturity. Infantilization is for Stiegler therefore immediately a negative development. However, Stiegler's works also contain a positive understanding of childhood and of the extension of childish characteristics into adulthood. The main thesis of this article is that this results in an unresolved tension in Stiegler's work. I therefore propose a notion of infantilization not as solely negative, but as fundamentally ambivalent and risky. The continuation of childhood into maturity is necessary for the life of the mind, yet it can also foreclose maturity altogether. I use this new notion of infantilization to correct some of Stiegler's radically conservative views on education and on the care for the new generations.