Infant mortality

Some babies die before they turn one.

This is a very sad thing. Many babies die from sickness. They may get sick from bad air or water.

Some babies are born too early. They need extra help to grow strong. Doctors can help by using clean water. They also use medicine to stop germs. This helps more babies live long lives. We can help babies stay well.

Infant mortality is when a baby dies before its first birthday.

Doctors measure this using the infant mortality rate. This is the number of deaths for every 1,000 live births. Many things can cause these deaths. Some babies are born too early. This is called preterm birth. A baby is preterm if it is born before 37 weeks. These babies may have trouble breathing. Their bodies may not be fully ready to work. Other causes include infections and heart problems. Some babies have conditions they are born with. These are called congenital malformations.

Many of these deaths can be prevented. Using clean water helps stop sickness. Vaccines also keep babies safe from germs. Good food helps babies grow strong. In 1950, the child mortality rate was 22.5%. By 2015, it dropped to 4.5%. This shows that health is getting better. Many countries are working to reach new health goals.

Infant mortality is the term for when a baby dies before its first birthday.

Scientists and doctors measure this using the infant mortality rate, or IMR. This is the number of infant deaths for every 1,000 live births. There is also a child mortality rate. This compares deaths for all children up to five years of age. These numbers help us understand how healthy a population is. They show how much help babies are getting to stay alive.

Many different things can cause these deaths. Some babies are born too early, which is called a preterm birth. A baby is preterm if they are born before 37 weeks. These babies may have trouble with their breathing or their skin. Their bodies might not be fully ready to work on their own. Other causes include infections, like pneumonia or malaria. Some babies are also born with conditions called congenital malformations. These are health problems that are present at birth, like heart defects.

Researchers have studied these patterns for a long time. In 1950, the global child mortality rate was 22.5%. By 2015, that number dropped significantly to 4.5%. The infant mortality rate also went down during that time. It fell from 65 deaths per 1,000 births to 29 deaths per 1,000. In 1990, there were 8.8 million infant deaths globally. By 2021, the number of children dying before age five dropped to 5 million. These numbers show that many people are working to improve health.

Many of these deaths can be prevented with simple steps. Using clean drinking water helps stop many sicknesses. Vaccines, or immunizations, protect babies from dangerous germs. Good nutrition and breastfeeding also help babies grow strong. In the United States, one big risk is low birth weight. This can be caused by many different things in a person's environment. In some places, like sub-Saharan Africa, the infant mortality rate is 68 deaths per 1,000 births. This is higher than in other regions studied.

We can see how much progress has been made through global goals. The United Nations used child mortality to track the Millennium Development Goals. Now, they use it for the Sustainable Development Goals. Goal Number 3 is to ensure healthy lives for everyone. An analysis of 200 countries found that 133 are already meeting this target. Another 13 countries are working toward meeting it by 2030. This shows that health is a major focus for the whole world. We are learning more every day about how to keep babies safe.

Infant mortality refers to the death of an infant before reaching their first birthday.

This metric is vital for understanding global public health and the well-being of populations. Scientists measure this using the infant mortality rate (IMR). The IMR is the number of deaths of infants under one year of age per 1,000 live births. A related metric is the child mortality rate, also called the under-five mortality rate. This compares the death rate of all children up to five years of age. These statistics help researchers track how medical care and living conditions change over time.

Researchers classify infant deaths into different stages based on when they occur. Perinatal mortality involves late fetal death or the death of a newborn within one week after birth. Neonatal mortality refers to deaths occurring within the first 28 days after birth. In developing countries, neonatal death accounts for 40% to 60% of all infant mortality. Postneonatal mortality includes deaths of children aged 29 days to one year. Major contributors to postneonatal death include malnutrition, infectious diseases, and problems in the home environment.

One major cause of infant mortality is preterm birth, or birth before 37 weeks of gestation. A full-term birth occurs at 40 weeks. Preterm births are subdivided into mild (32–36 weeks), very preterm (28–31 weeks), and extremely preterm (under 28 weeks). These births can be spontaneous or medically induced. Spontaneous births happen due to natural labor or the rupture of the amniotic sac. Medically induced births occur when continuing a pregnancy poses risks to the parent or fetus. These risks include conditions like preeclampsia or diabetes.

Preterm infants face high risks because their organ systems are not fully developed. The respiratory system is often affected, leading to conditions like respiratory distress syndrome or apnea. Other systems, such as the gastrointestinal, immune, and cardiovascular systems, also require more time to mature. Many preterm births are associated with inflammation in the body. Scientists look for biomarkers of inflammation, such as C-reactive protein or cytokines, to understand these risks. In low-income countries, the survival rate for infants born before 28 weeks is only 10%. In high-income countries, that survival rate is 90%.

Another significant cause is Sudden Infant Death Syndrome (SIDS). SIDS is the sudden death of an infant under one year of age where no cause is detected after an investigation. It is more common in Western countries. Researchers use a "triple-risk model" to study SIDS. This model suggests three factors contribute: smoking during pregnancy, the age of the infant, and certain sleeping conditions. These conditions include sleeping on the stomach, overheating, or covering the face. The "Back to Sleep" campaign encouraged sleeping on the back, which lowered SIDS rates by 50%.

Congenital malformations are health conditions present at birth, such as heart defects or cleft lip. In developed countries like the United States, these account for a rise in infant deaths. However, in less developed regions, malnutrition and infectious diseases remain the leading causes. For example, in the Caribbean and Latin America during the 1980s, malformations only caused 5% of deaths. In those same areas, malnutrition and disease caused between 7% and 27% of deaths. Many of these deaths are preventable through low-cost measures. These include vaccinations, breastfeeding, improved nutrition, and access to clean drinking water.

Global health data shows a massive improvement in infant survival over the last century. In 1950, the global under-five mortality rate was 22.5%. By 2015, this rate dropped to 4.5%. During that same period, the IMR fell from 65 deaths per 1,000 live births to 29. In 1990, 8.8 million infants died globally. By 2021, the number of children dying before age five had dropped to 5 million.

These trends help international organizations set goals for the future.

Reducing child mortality is a central part of international development. The United Nations used child mortality to monitor the Millennium Development Goals. Now, it is part of the Sustainable Development Goals (SDGs). Goal Number 3 aims to ensure healthy lives and promote well-being for all ages. An analysis of 200 countries showed that 133 are already meeting the SDG target. Another 13 countries are trending toward meeting the target by 2030. This progress shows how medical science and public health work together to save lives.