BabySens: An Ethical Framework for Developmentally-Aligned Infant-Technology

Digital device usage now transcends age and demographic boundaries, having become commonplace among children from all racial and ethnic groups. The rapid proliferation of touch screen use among infants (6–24 months) has outpaced evidence-based design standards, creating an urgent need for developmentally-grounded interfaces. In this paper, BabySens-an ethical Infant-Centered HCI Design (ICHD) framework that integrates stage-aligned interactions adapting to sensorimotor abilities, real-time scaffolding via on-device ML, built-in guardrails, and hybrid physical-digital play is developed using Bluetooth-connected toys. Through an approved and controlled lab study with infants (N = 12), our object permanence teaching prototype demonstrated significantly higher touch accuracy of 83–90% CI [78%, 88%] vs. 52% [45%, 59%] in controls; *p* < 0.001, Cohen’s *d* = 1.87) and no sustained distress events compared to commercial apps, with positive transfer effects to real-world tasks (ρ = 0.41). Machine learning analysis revealed that the adaptive system reduced error distances by 68% for infants less than 12 months. These pilot study results challenge current "baby-proofing" approaches, showing that developmental alignment enhances efficacy while reducing risks. This paper emphasizes the need for larger-scale validation and advocate for industry standards based on Piagetian developmental milestones and parental mediation tools, offering BabySens as a concrete template for responsible infant-tech design that prioritizes learning over engagement.