Every parent knows the moment. Your baby finally drifts off in your arms after twenty minutes of gentle rocking, their breathing settles into that peaceful rhythm, and you begin the delicate transfer to the crib. The instant their back touches the mattress, their eyes snap open. Yukai Engineering’s Necoron, making its debut at CES 2026, aims to eliminate this guessing game entirely. The device monitors your infant’s heart rate through a small ankle sensor and uses LED color indicators to tell you exactly when your baby has reached a sleep state deep enough for a successful transfer.
The Tokyo-based robotics company brings the same thoughtful design approach that earned them recognition for products like Qoobo and Nékojita FuFu. Necoron was developed based on research from RIKEN, one of Japan’s leading research institutions, giving it scientific backing that sets it apart from typical baby gadgets. At the Yukai Engineering booth in CES’s Smart Home area, the prototype represents an intriguing intersection of biometric monitoring, sleep science, and practical parenting tools. Takara Tomy is collaborating on the project, with the companies targeting a 2026 market launch.
Designer: Yukai Engineering Inc.
The ankle band wraps around the baby’s leg with a soft fabric strap and houses a rounded white sensor module that, yes, looks exactly like a ‘house arrest wearable’, so to speak. But instead of tracking curfew violations, you’re monitoring optimal nap conditions, which feels like a fair trade when you’re on hour three of failed transfer attempts. The sensor feeds heart rate data to a separate main unit that displays color-coded LED signals: walk while holding, sit and hold, or the magic moment when you can finally lay them down. You press a button to start monitoring and then just glance at the color while your hands stay where they belong, supporting 12 pounds of sleeping chaos. The minute the Necoron’s light turns blue, your baby’s in the right state of mind to be put to bed without triggering the ‘back switch’.
What makes this work is the RIKEN research foundation, which identified specific heart rate patterns that indicate when babies have moved past vulnerable light sleep into something stable enough to survive the sensory avalanche of being put down. Temperature changes, vestibular shifts, tactile feedback differences, all of it conspires to wake your kid the second their back hits the mattress. Yukai’s algorithms predict when that transfer window actually opens instead of making you guess based on how long their eyes have been closed. The company hasn’t released the exact parameters yet, but the core logic tracks: deeper sleep stages show different cardiovascular signatures than drowsiness.
Yukai Engineering keeps building robots that solve real problems without feeling clinical about it. Their Nékojita FuFu made TIME Magazine’s Best Innovations of 2025 for blowing on hot drinks with randomized breath patterns. BOCCO emo won CES 2023 Innovation Awards as a family communication platform. They understand that helpful tech can also feel delightful, which matters when you’re trying to convince exhausted parents to strap another device onto their infant. Necoron launches sometime in 2026, pricing TBD, and whether it becomes essential nursery gear depends entirely on whether those algorithms actually work at 3 AM when nothing else has.