Marie-Noëlle Simard still remembers the quiet worry in parents’ eyes when their premature baby, born at 32 weeks, was cleared to go home with no follow-up plan—treated, in effect, like any full-term infant. At CHU Sainte-Justine in Montreal, where Simard works as an occupational therapist, that gap in care sparked a mission: to find a way to identify which babies born moderately premature are at risk for developmental delays before those delays become irreversible. Now, a breakthrough sensor developed by Canadian researchers is offering hope. Placed gently on a baby’s forehead, the noninvasive device measures how efficiently the brain uses oxygen—a window into future cognitive, language, and motor development. For the first time, scientists have linked early brain oxygen metabolism with neurodevelopmental outcomes at age two, opening the door to earlier, life-changing interventions.
Premature babies born between 29 and 36 weeks make up the majority of preterm births in Canada, yet they often slip through the cracks of long-term monitoring. Unlike infants born before 29 weeks, who receive systematic follow-up, these babies typically leave the hospital with no special developmental tracking. "Most of these babies leave the hospital without further follow-up, as if they had been born at term," Simard said. That’s a problem, because the study of 241 infants found that nearly one in three showed developmental delays by age two, with language delays affecting 29%. The research, led by Mathieu Dehaes and Thuy Mai Luu at Université de Montréal and published in Scientific Reports, used a dual optical technology—FDNIRS and DCS—to measure both oxygen delivery and consumption in the brain at term-equivalent age. Two years later, the children were assessed using the Bayley-4 scales, the gold standard in early neurodevelopment testing.
The results were striking: the more efficiently a baby’s brain extracted and used oxygen, the stronger their cognitive and language scores at age two. Average cognitive and language scores for the group were already below the normative average of 100, landing between 95 and 98. But the starkest disparities emerged between boys and girls. Boys not only had significantly lower language (92 vs. 99) and motor (98 vs. 101) scores, but the link between brain oxygen use and future development was far stronger in males, suggesting a neurological vulnerability that demands sex-specific care strategies.
"We don’t yet fully understand why some premature infants show lower oxygen metabolism," said Dehaes, whose work is based at the Azrieli Research Centre. "But we believe that premature birth during the third trimester, a critical period of brain development, may affect the metabolic demand needed to support this rapid and increased maturation." The sensor, which requires no radiation or sedation, could soon become a routine part of neonatal assessments, helping doctors target early therapies to those who need them most. As the team works to validate the tool in larger populations, the promise is clear: a simple forehead sensor could reshape how we support the tiniest, most overlooked preemies—giving them not just a start in life, but a stronger one.