WHO defines preterm birth as a baby being born alive before 37 completed weeks of pregnancy.
How to read this guidance
Newborns have limited reserves and may show illness through feeding, temperature, colour, breathing or alertness rather than a specific complaint. The same observation can have several causes, so early professional assessment is safer than waiting for a textbook pattern.
The sections below retain the factual scope of the linked source. They add practical questions and safety-netting without claiming that a symptom, measurement or exposure proves a diagnosis in one child.
What does preterm birth mean?
WHO defines a preterm baby as a baby born alive before 37 completed weeks of pregnancy.
How does WHO group preterm birth by gestational age?
WHO describes three gestational-age groups: extremely preterm at less than 28 weeks, very preterm from 28 to less than 32 weeks, and moderate to late preterm from 32 to 37 weeks.
How common is preterm birth globally?
WHO estimated that 13.4 million babies were born preterm in 2020. WHO also reports substantial differences between countries in both preterm-birth rates and survival.
Why can preterm birth happen?
WHO states that many preterm births happen spontaneously, while others occur because pregnancy complications create a medical reason for an earlier birth. Multiple pregnancy, infections and chronic conditions are among associated factors, but in many cases no single cause is identified.
Why do outcomes differ between settings?
WHO describes large global inequalities in survival and disability after preterm birth, reflecting differences in access to appropriate maternal and newborn care.
What to observe and record
- quality and frequency of feeds
- wet diapers, stool and weight trend
- temperature, colour and breathing pattern
- wakefulness, tone and the ease of settling
Keep the record focused on the illness described above: onset, fever or pain pattern, relevant contact or travel, breathing, drinking, urine output, alertness and any rapid change. These details help a clinician compare the child’s course with the source-defined pattern without treating the checklist as a diagnosis.
Practical next steps
- keep the birth, pregnancy, screening and discharge records together
- follow the feeding and follow-up plan given by the newborn team
- avoid unprescribed remedies, supplements or direct heat sources
- contact the maternity or newborn service promptly when feeding or behaviour changes
Use the prevention measures that the official source actually describes and follow local public-health advice when exposure or school attendance is relevant. Treatment and testing depend on the child and should come from a qualified professional; do not use leftover antibiotics or another person’s prescription.
When urgent assessment is needed
- poor feeding with unusual sleepiness or weak cry
- grunting, chest indrawing, blue colour or breathing pauses
- fever, low temperature, seizure or difficulty waking
- very few wet diapers, repeated vomiting or rapidly increasing jaundice
Young infants and children with immune, heart, lung, blood, metabolic or neurologic conditions may need earlier assessment. Use local emergency services whenever delay could be dangerous.
Preparing for a healthcare visit
Ask which findings support the suspected infection, whether testing changes care, what prevention applies to contacts, and which change requires urgent reassessment. Bring the exposure and symptom timeline plus vaccination, medication and allergy information.
If safe, a photograph of a changing rash or brief video of an unusual movement can help show what happened outside the clinic. Never delay emergency care to make a recording. For a possibly contagious illness, telephone ahead before entering a shared waiting area.
Following the plan at home
Make sure every caregiver understands the same plan. Record meaningful changes rather than checking constantly, protect rest and hydration, and keep follow-up appointments. Improvement in one symptom does not cancel a new red flag, while one mild symptom in an otherwise well child does not establish a serious condition.
Before leaving a visit, repeat the plan back in your own words: what to do today, when to follow up, whether school or childcare attendance should change, and where to go if the child worsens outside normal clinic hours.
Questions this page cannot answer for one child
This page cannot confirm the organism, site of infection, contagious period or treatment for an individual child. Similar early symptoms can have different causes, and severity depends on examination, age, immunity, exposure and the child’s current condition.
Ask the healthcare professional how the child’s age and medical history change the interpretation, what alternative explanations remain possible, and whether observation, testing, referral or treatment is appropriate. When no test is needed, ask what expected improvement should look like and how long it is reasonable to wait.
Document who provided the advice, the planned review time and any agreed precautions so that another caregiver or service can understand what has already been assessed.
If the family faces language, transport, cost or access barriers, mention them directly. A safe plan must be practical enough to follow, and the service may be able to adjust timing, written instructions or referral arrangements.
Keep the original source link and review date with the notes so later readers can distinguish the published evidence from the individualized clinical plan.
Limits and source boundaries
Read the publication date and scope of the source. A global fact sheet may describe burden and prevention without providing a local treatment pathway; a surveillance or screening page may describe population practice without estimating one child’s risk.
Recommendations, schedules and available services differ by country and can change. Use the official source for its stated evidence and a qualified professional for decisions about the individual child.