When Maria Korja's daughter was born three months early, weighing just over two pounds, the nurses in the neonatal unit told her something that stuck: talk to her, hold her skin-to-skin, respond when she fusses. "I didn't know if it would matter," Korja recalls. "She was so tiny. But I tried."
Now, a major new study gives Korja's instincts a powerful scientific backing. Researchers at the University of Oulu in Finland led an international team that tracked 2,469 mothers and their children across five countries — Germany, the Netherlands, Australia, New Zealand, and Israel — and found that a mother's sensitivity to her child's needs can protect even the smallest, most premature babies from emotional and behavioral problems years later.
The study, published in the journal Developmental Medicine & Child Neurology, followed children born between 1980 and 2014. About 1,062 of those mother-child pairs were tracked all the way into adolescence. The pattern held true everywhere the researchers looked: children born prematurely — before 37 weeks of pregnancy — face higher risks of attention problems, social struggles, and difficulty managing emotions. But when mothers responded warmly, promptly, and in ways that actually matched what their child needed, those risks dropped.
"Maternal sensitivity acts as a modifiable factor through which the effects of prematurity on later development are conveyed," said Elina Jokiranta-Olkoniemi, a university lecturer at the University of Oulu who co-authored the study. In plain terms, this means it's something parents can learn and improve — not a fixed genetic trait or an unavoidable consequence of a difficult birth.
The findings add to a growing understanding that early relationships shape brain development in profound ways. "The study strengthens our understanding that early-life environmental factors can play a decisive role in a child's developmental pathway, even when the starting point is vulnerable," said Julia Jäkel, a professor at University Hospital Essen in Germany who previously worked on the study at Oulu. She argues that programs teaching parents how to read and respond to their baby's cues should be expanded, especially for families of preterm infants.
Finland already has a head start. The country operates a network of child health clinics that reaches nearly every family with young children. Jokiranta-Olkoniemi suggests those clinics could systematically offer guidance on sensitive parent-child interaction — a low-cost way to give vulnerable children a stronger foundation. The same approach could work in parenting classes, pediatric checkups, and even school counseling programs.
For parents like Korja, now watching her daughter navigate teenage years with her friends and schoolwork, the message is simple: those small moments of connection — the eye contact, the gentle voice, the responsive hug — add up. "I didn't do anything special," she said. "I just tried to be there." According to this research, that may have been exactly what mattered most.