Researchers in China followed 111 babies—75 born prematurely and 36 born full-term—from birth to 6 months. They used a simple breathing test to measure lung function and wanted to understand whether early babies would eventually develop lungs as strong as full-term babies, and which ones might face lasting breathing trouble.
This research matters for Singapore families because our country has high rates of assisted conception and mothers having babies at older ages, both linked to prematurity.
Moderately early babies catch up; very early babies need more time
Babies born between 32 and 36 weeks showed lung function matching full-term babies by 6 months corrected age (counting from due date, not birth date). However, babies born before 32 weeks still had weaker breathing patterns at the 6-month mark, suggesting their lungs need longer to mature. The earlier a baby arrives, the longer this process typically takes.
Early breathing problems predict later trouble
About 1 in 5 preterm babies developed respiratory infections like pneumonia or recurrent wheezing by 6 months—more than twice the rate in full-term babies. Babies with stronger lung function at the corrected 40-week mark were significantly less likely to develop these problems later. This means early lung strength is a useful indicator of future breathing health.
Three birth factors shape lung development speed
Mothers' older age, babies needing breathing support immediately after birth, and lower Apgar scores (a quick health check performed right after delivery) were linked to slower lung maturation. Interestingly, gestational diabetes—often a concern for expecting parents—did not independently slow lung development once researchers accounted for the baby's birth weight.
What preterm parents can do now
- Use corrected age when tracking lung milestones: if your baby was born at 32–36 weeks, expect normal lung function by 6 corrected months.
- Ask your paediatrician about closer monitoring during the first year if your baby was born before 32 weeks or needed breathing support at birth.
- Watch for respiratory infections during Singapore's high-risk seasons, as early-born babies face double the infection rate of full-term peers.