Everything you need to know about devices for listening to your baby's heartbeat

Expectant parents are often eager to hear their unborn child's heartbeat for the very first time. For this, there are several types of device available for listening to the baby's heart throughout pregnancy. This article presents the features and characteristics of the different devices available on the market, along with their advantages and disadvantages.

The foetal Doppler: a device suited to professionals

A foetal Doppler is a medical device used by doctors and midwives to detect and measure the heartbeat of the foetus from the first trimester of pregnancy. Its technology is based on the use of ultrasound waves that are sent into the uterus and reflected back by the baby's heart, allowing the foetal heart rate to be determined.

Foetal Dopplers can be classified according to their wave emission frequency: low-frequency Dopplers (frequency of 3 MHz or below) and high-frequency Dopplers (frequency above 3 MHz). The former offer better tissue penetration, whilst the latter provide more precise and higher-quality images.

Advantages: high accuracy, clear and sharp image, early detection of the foetal heartbeat

Disadvantages: requires specific training, can be costly to purchase

Alternatives for parents: the Pinard stethoscope and foetal monitors

Although the foetal Doppler is reserved for healthcare professionals due to its technical complexity, there are other simple methods that allow expectant parents to listen to their baby's heartbeat at home.

The Pinard stethoscope: a traditional yet effective tool

The Pinard stethoscope is an obstetric instrument invented in the 19th century by French physician Adolphe Pinard. It is a simple funnel made of wood or metal, one end of which is placed on the pregnant woman's abdomen whilst the other is held to the ear of the person conducting the examination. This device amplifies the sounds produced by the foetal heart, making the heartbeat audible from around the 20th week of pregnancy.

Advantages: simple to use, no risk to the mother or baby, affordable price

Disadvantages: less accurate than the foetal Doppler, difficulty distinguishing background noise (baby's movements, mother's blood circulation, etc.)

Home foetal monitors: for reassuring and enjoyable monitoring

Beyond the Pinard stethoscope, there are electronic devices available for listening to the baby's heartbeat at home. These foetal monitors work on the same principle as foetal Dopplers, but with simpler and less expensive technology.

These devices are generally fitted with an external microphone that is placed on the pregnant woman's abdomen and picks up the sounds produced by the foetal heart. The heartbeats, as well as other sounds such as the baby's movements and hiccups, can be heard through headphones or a built-in speaker.

Advantages: easy and intuitive to use, affordable price, possible to record the sounds to share with loved ones

Disadvantages: lower sound quality than a foetal Doppler, difficulty finding the ideal position to pick up the heartbeat

The choice of device depends on each expectant parent's needs and expectations

In general, the choice of device for listening to the baby's heartbeat should be made in line with each expectant parent's preferences and expectations. Foetal Dopplers will suit professionals and those seeking high accuracy, whilst the Pinard stethoscope or home foetal monitors can be considered for home use.

It is important to emphasise, however, that using a device to listen to the baby's heartbeat should not replace regular medical examinations carried out by healthcare professionals, which remain essential for ensuring the pregnancy and the development of the foetus are properly monitored.