AP Syllabus focus:
‘Infant mortality is influenced by mothers’ access to good healthcare and nutrition; changes in these factors can shift infant mortality rates over time.’
Infant mortality rate is a widely used indicator of environmental quality, public health capacity, and social conditions. Understanding what drives it helps explain why mortality patterns differ among places and why they change over time.
Measuring infant mortality
Infant mortality rate (IMR) is usually reported per 1,000 live births in a given year and reflects risks during the most vulnerable life stage.
Infant mortality rate (IMR): The number of deaths of infants under age one per 1,000 live births in a population during a specified time period.
Because infants are highly sensitive to infection, dehydration, temperature extremes, and poor nutrition, IMR often responds quickly to improvements or declines in living conditions.
This figure shows how the daily risk of infant death changes across the first year of life, using U.S. national data (2017–2020). Mortality risk is highest on the day of birth and then declines steeply over the first weeks, highlighting why prenatal, delivery, and early postnatal healthcare can disproportionately reduce infant deaths. Source
Core drivers in the AP syllabus: healthcare and nutrition
Mothers’ access to good healthcare
In the syllabus framing, mothers’ access is central because many infant outcomes are determined before birth and during delivery.
Prenatal care availability
Screening and management of pregnancy complications (e.g., hypertension, gestational diabetes)
Prevention and treatment of maternal infections that can affect fetal development
Skilled birth attendance and emergency obstetric care
Safer deliveries (ability to manage hemorrhage, obstructed labor, neonatal distress)
Reduced risk of birth trauma and oxygen deprivation
Postnatal care for mother and infant
Early detection and treatment of neonatal infections
Support for breastfeeding and newborn thermal regulation
Vaccination access and routine infant healthcare
Fewer deaths from vaccine-preventable diseases where immunisation coverage is high
Environmental and logistical barriers can limit access even when services exist:
Distance/transport, clinic understaffing, medication shortages
Cost (fees, lost wages) and unequal distribution of services within a country
Disruptions from disasters, conflict, or infrastructure failure that reduce service reliability
Mothers’ access to good nutrition
Maternal nutrition affects fetal growth, birth weight, immune function, and breastfeeding success, linking food systems and environmental conditions directly to infant survival.
Adequate calories and protein
Lowers risk of low birth weight and premature birth, which increase infant vulnerability
Micronutrients
Iron and folate status influence anemia and healthy development
Iodine and vitamin A deficiencies can worsen developmental and immune outcomes
Food security and dietary diversity
Stable access to varied foods supports healthier pregnancies and lactation
Environmental science connections that shape nutrition include:
Drought, soil degradation, and crop failure reducing household food supply
Contaminated food and water increasing disease burden and reducing nutrient absorption
Seasonal hunger (“lean seasons”) causing short-term spikes in undernutrition risk
How changes shift infant mortality rates over time
The syllabus emphasises that changes in healthcare and nutrition can shift IMR. In practice, IMR may fall or rise over months to years as these conditions improve or deteriorate.
Pathways to declining IMR
Expansion of primary healthcare, prenatal visits, and skilled delivery care
Improved vaccination coverage and availability of antibiotics/rehydration therapy
Better maternal diet quality through increased food availability, supplementation, or safety-net programs
More reliable clean water and sanitation reducing diarrheal disease that is especially lethal to infants
Pathways to increasing IMR
Healthcare disruption from economic crises, conflict, or severe storms
Reduced food access from crop failures, price spikes, or supply-chain interruptions
Disease outbreaks that overwhelm clinics and reduce routine maternal/infant care
Chronic undernutrition that increases the proportion of infants born preterm or underweight
Time lags and uneven change
IMR often changes unevenly because improvements may reach urban areas first, while remote or marginalised communities see slower gains. Some interventions (e.g., restoring clinic staffing) can reduce mortality quickly, while others (e.g., improving long-term maternal nutrition) may show gradual effects across multiple birth cohorts.
FAQ
IMR counts deaths before age one only; under-five mortality includes ages one to four as well.
Under-five rates are often influenced more by injuries, later childhood infections, and longer-term nutrition than IMR.
Hospitals may not improve access for pregnant people if barriers remain.
Common reasons include:
user fees and indirect costs
long travel times and poor roads
shortages of staff, medicines, or blood supplies
Iron deficiency (maternal anaemia) can increase complications and low birth weight.
Folate, iodine, and vitamin A deficiencies can worsen development and immune protection, indirectly increasing vulnerability.
Repeated diarrhoeal illness reduces nutrient absorption and increases dehydration risk.
During pregnancy and infancy, this can compound undernutrition and raise the risk of severe outcomes from otherwise treatable infections.
Household recovery may take time: debt, depleted savings, and lost livestock/crops can persist.
Maternal health improvements may require months of better diet before translating into healthier births and more resilient infants.
Practice Questions
Define infant mortality rate (IMR). (2 marks)
States it is deaths of infants under age one (1)
States per 1,000 live births in a population over a given time period, typically a year (1)
Explain how mothers’ access to healthcare and nutrition can change infant mortality rates over time. (6 marks)
Explains that improved prenatal care reduces pregnancy/birth complications affecting infant survival (1)
Explains that skilled birth attendance/emergency obstetric care reduces deaths during delivery (1)
Explains that postnatal care/early treatment reduces neonatal infection-related deaths (1)
Explains that improved maternal nutrition reduces low birth weight/prematurity, lowering infant vulnerability (1)
Explains that better nutrition supports breastfeeding and infant immunity (1)
States that deterioration or disruption to healthcare/food access can increase IMR, so rates shift over time as access changes (1)
