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Protoplanetary disk formation is a natural outcome of prestellar core collapse. During the embedded class 0/1 phase, the close interaction with the infalling envelope should not be neglected when considering the dynamics and evolution of the disk. While evolved disks show larger sizes and a wide diversity of morphologies, recent observations suggested that young disks are mostly small (<50 au). I will present our recent work (https://arxiv.org/abs/2109.05823) on the self-regulated disk formation, where the magnetic braking is moderated by the nonideal magnetohydrodynamic effects. The resulting disk radius is slowly varying for a wide range of physical parameters, which explains for the observed small disk size.