Before Ultrasound, How Did Doctors Know a Baby Was Developing Normally?

Today, an ultrasound scan can show a developing baby in remarkable detail. Doctors can estimate gestational age, check growth, examine anatomy, and assess the position of the placenta and baby.

But pregnancy care existed for thousands of years before ultrasound became part of medicine. So how did doctors know whether a baby was developing normally?

Pregnancy Was Monitored Through The Mother's Health

Before modern imaging, doctors and midwives primarily followed the mother's physical condition.

They recorded the date of the last menstrual period to estimate how far the pregnancy had progressed. They also monitored weight, blood pressure, swelling, and other symptoms that could indicate problems.

The growth of the abdomen was another important clue. As pregnancy progressed, doctors could assess the increasing size of the uterus by examining the abdomen.

However, these observations could not show the baby directly. A pregnancy could appear normal from the outside while a problem remained undetected.

Doctors Used To Feel The Abdomen To Understand The Baby's Position

One of the oldest clinical techniques was palpating the pregnant woman's abdomen.

Doctors could use their hands to feel the uterus and determine where the baby was positioned.

This eventually became formalised as Leopold's manoeuvres, a series of four abdominal examinations used to identify the baby's position and presentation and estimate its size.

By feeling the abdomen, an experienced practitioner could identify the baby's head, back and limbs, particularly later in pregnancy. This was useful for understanding whether the baby was positioned head down or in another presentation before delivery.

But it could not provide the detailed information that an ultrasound gives today.

Also Read: Trimester-by-Trimester Guide: What to Do and What to Avoid for a Safer Pregnancy

The Baby's Movements Became An Important Sign

Once the mother began feeling the baby move, these movements provided another window into fetal well-being. Doctors would ask whether the baby was moving and whether there had been a noticeable change in activity.

A reduction in movements could be concerning because fetal movement is one indication that the baby is active. However, movement patterns vary naturally, and without imaging, doctors could not directly observe what was happening inside the womb.

Research into fetal movement as a measure of development came much later. By the 1970s, ultrasound allowed researchers to observe fetal movements directly and study their relationship with development.

Then Came The Foetal Heartbeat

One of the biggest breakthroughs before ultrasound was learning how to listen to the baby's heartbeat.

The fetal heartbeat was first detected using a stethoscope in the early 19th century. Historical research places the discovery in 1818, following the invention and growing use of the stethoscope.

This changed pregnancy care considerably.

Listening to the heartbeat allowed doctors to confirm that the fetus was alive and provided information about its condition during pregnancy and labour.

However, there was a major limitation: doctors could not hear the heartbeat in very early pregnancy. They also could not see the baby's organs, measure its size precisely, or identify many abnormalities.

Doctors Also Watched For Warning Signs In The Mother

Pregnancy complications were often identified through symptoms affecting the mother.

• Severe swelling, headaches, bleeding, high blood pressure, abdominal pain, or changes in general health could raise concerns.
• Doctors also relied on blood and urine tests as medical testing developed. These could reveal conditions such as anaemia or protein in the urine, which could indicate pregnancy complications.

But these tests generally provided information about the mother's health rather than a detailed picture of the fetus.

There was no way to routinely see the baby

This was the biggest difference between pregnancy care then and now.

Before ultrasound, doctors had no routine method of looking inside the uterus and checking the baby's anatomy.

They could not reliably see whether the baby's brain, heart, kidneys or spine were developing normally. They could not accurately measure fetal growth in the way modern ultrasound does.

Some abnormalities could occasionally be suspected from physical findings, unusual abdominal size or problems with the pregnancy, but many could only be recognised after birth.

When Did Ultrasound Change Pregnancy Care?

Medical ultrasound began developing in the 1950s, but its use in obstetrics took off after a landmark 1958 paper by Scottish obstetrician Ian Donald, engineer Tom Brown and colleague John MacVicar.

Their work described the use of pulsed ultrasound for examining abdominal masses and included some of the earliest ultrasound images of a fetus.

During the following decades, ultrasound technology improved rapidly.

Doctors gradually learned to measure the baby's head and body, estimate gestational age, and assess fetal growth. By the late 1960s and 1970s, ultrasound was becoming increasingly useful in routine obstetric care.

Also Read: Ultrasound vs CT Scan for Kidney Stones: Which Test Is Better?

Why ultrasound was such a revolution

Ultrasound changed pregnancy care because it allowed doctors to move from indirect clues to direct observation.

• Instead of relying only on the size of the uterus or the mother's description of fetal movements, doctors could actually see the fetus.
• Modern scans can assess fetal growth, anatomy, position, amniotic fluid and, with Doppler technology, blood flow through important vessels.

This has made it possible to identify many pregnancy complications much earlier than was previously possible.

Final Word

Before ultrasound, doctors did not have a single test that could confirm that a baby was developing normally. They built a picture from several clues: the mother's health, the growth of the uterus, abdominal examination, fetal movements, and the baby's heartbeat. The arrival of ultrasound in the mid-20th century transformed pregnancy care by allowing doctors to see and measure the developing baby rather than relying almost entirely on indirect signs.