When Does a Baby's Heartbeat Start? Understanding Ultrasound Scans

When expecting a child, the expectant parents may experience a rollercoaster of emotions be it anxiety, happiness, excitement and even nervousness. Amongst all this emotional fiesta, one of the most thrilling moments for any expectant parent is that point in time when they get to hear their baby's heartbeat for the very first time. If you are in the early stages of pregnancy and looking for an answer to “When will the heartbeat start for my baby?”, you have come to the right place. This tiny yet powerful sound serves as a reassuring indicator of the baby's health and development.  

Understanding the timeline and the processes involved may ease anxieties and better prepare the parents for this monumental experience. In this blog, we go in-depth into the stages of foetal heart development, the role of ultrasound heartbeat scans in this development and what you can expect during this very important phase of pregnancy. 

When Does Heartbeat Begin in Pregnancy? 

One of the most asked questions by expectant parents is, "When does the heartbeat begin in pregnancy?" The foetal heart begins its early development at around fifth week of pregnancy. However, it is not until the sixth week that the heart starts beating. At this point in the development of the heart, it merely consists of a tube-like structure. By the seventh or eighth week, it will have developed enough to beat in a more regular rhythm that will often be detectable during a heartbeat scan. 

What to Expect During Your First Ultrasound Appointment 

Your first ultrasound appointment generally falls within a window of the 8th to the 12th week of pregnancy. In this scan, your healthcare provider will perform a transvaginal ultrasound to achieve a sharp image of the developed foetus. This is usually the first chance one gets to hear the baby's heartbeat. That moment, when the heartbeat starts for the baby, is always both thrilling and nerve-wracking; however, remember that every pregnancy progresses differently.  

Why You May Not Hear Baby's Heartbeat?

If you are not able to hear your baby’s heartbeat at this time, it is important to stay calm and not come to any conclusion. There may be a number of reasons why your baby's heartbeat is not immediately discernible in an early ultrasound. Even if the ultrasound results fail to give you a sharp visual of the baby’s heart, it is almost never an indication of a problem. Some reasons why you may not be able to hear the baby’s heart are:  

• Gestational Age: When the pregnancy is actually earlier than it is believed or thought to be, the foetal heart is just not large enough to appear in the sonogram. 

• Position of the Uterus: A tilted uterus may not allow early detection of the heartbeat. 

• Maternal Factors: The mother's weight can affect the quality of ultrasound images of a baby, including the heart’s image. Excessive body fat can make it difficult to get a clear image of the baby’s heart in ultrasound. 

What Devices Are Used to Hear a Baby's Heartbeat? 

Following are some of the most effective and widely used devices for detecting a baby's heartbeat: 

1. Transvaginal Ultrasound: This is normally used during early stages of pregnancy, commonly between 6-12 weeks. 

2. Doppler Ultrasound: This is usually done after the 12th week but can be used at any time during pregnancy. 

3. Fetoscope: A stethoscope designed for this purpose; it is used a little later in pregnancy, around the 20th week and onwards. 

 Can You Hear a Baby's Heartbeat with Human Ear? 

The heartbeat of a baby is just too minute to be distinctly heard with the human ear amidst the usually thick layers of tissues and fluid casing the foetus. Some parents report being able to feel the rhythm of a heartbeat by leaning against the belly later in pregnancy, but more than likely, that would be the mother's pulse or kicking.  

Can You Hear a Baby's Heartbeat with Apps? 

Because technology has come a long way, there are several types of apps available with which you supposedly can hear your baby's heartbeat with your smartphone. While these can be entertaining to play with, they don't come anywhere close to the more sophisticated medical-grade equipment. Always consult your healthcare provider for any accurate and reliable information regarding the heartbeat of your baby.  

Heartbeat Changes Throughout Pregnancy 

The heartbeat of the baby changes throughout the pregnancy. Generally, in the early stages, around the 6th week of pregnancy, it starts with a rate of about 90-110 beats per minute. It may increase to 140-170 beats by the 9th to 10th week and then finally stabilise to an average of 110-160 beats for the rest of the pregnancy. These are normal changes in the development of the foetus, in which these heart rates are regularly followed to ensure your baby’s health. 

Conclusion 

Being informed about when the heartbeat of the foetus starts and what exactly one should expect at that time will go a long way in calming all those anxieties related to early pregnancy. The day you first get to hear the heartbeat of your baby is a special occasion since a new life has begun. While various factors may interfere with the detection, rest assured that the development of medical technology will always keep you as close as possible to monitoring your baby's heartbeat. Always consult your healthcare provider for accurate information and support throughout your pregnancy.