> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sonohealth.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Fetal Doppler in the Second Trimester — Weeks 14–27

> The second trimester is when home fetal doppler use with HeartBeats™ becomes most reliable and enjoyable. What to expect from weeks 14–27, including movement, positioning, and sharing the experience.

## Why the Second Trimester Is the Sweet Spot

The second trimester — weeks 14 through 27 — is when home fetal doppler use becomes most rewarding and reliable. By week 14:

* The uterus is clearly above the pubic bone and easily accessible abdominally
* The fetal heart is larger and more distinct on doppler
* Baby movements are beginning and are often detectable
* Detection typically takes under 2 minutes for experienced users

Most parents find that second-trimester sessions are consistent and emotionally gratifying — you can often find the heartbeat in 30 seconds.

## Where to Place the Probe in the Second Trimester

The uterus rises progressively through the second trimester:

| Week        | Fundal Height (Uterus Top)    | Probe Starting Position       |
| ----------- | ----------------------------- | ----------------------------- |
| 14–16 weeks | Just above pubic bone         | Low abdomen, above hairline   |
| 18–20 weeks | Near belly button             | Mid-abdomen                   |
| 20–24 weeks | At or above belly button      | Around and above belly button |
| 24–27 weeks | Several cm above belly button | Upper-mid abdomen             |

A general rule: your **fundal height in centimeters roughly equals your gestational week** (e.g., 20 weeks → fundus at \~20cm above pubic bone). Start your probe search at that level.

## Baby's Position and Finding the Heart

In the second trimester, the fetal heartbeat is loudest when the probe is aimed at the **chest** of the baby. The heart is on the left side of the chest, so:

* If baby is facing left (left occiput anterior): strongest signal often to your right side
* If baby is facing right: strongest signal to your left
* Spend 30–45 seconds in each position before moving

You may also hear placental sounds — a rushing, lower-frequency "whoosh" at your own heart rate rhythm. This is completely normal and is simply blood flow through the placenta.

## Fetal Movements in the Second Trimester

Many parents first feel fetal movement (**quickening**) between weeks 16–22. When using HeartBeats™ during this phase:

* Sudden scratching or static sounds during a session are often the baby kicking or moving the probe
* You may hear the BPM suddenly accelerate (heart rate reactivity to movement) — this is a reassuring sign of fetal autonomic health
* Baby may "swim away" from the probe, requiring repositioning

## Normal Second-Trimester Heart Rate Ranges

| Week        | Expected Range |
| ----------- | -------------- |
| Weeks 14–20 | 140–170 BPM    |
| Weeks 20–27 | 120–160 BPM    |

Heart rate generally trends downward through the second trimester as the parasympathetic nervous system matures. Both ends of the normal range are normal — what matters is that it stays within 110–160 BPM by mid-second trimester.

## Sharing the Experience

The second trimester is the ideal time to:

* **Record the heartbeat** and share with family
* **Involve older children** by letting them listen — a common way to introduce them to the baby
* **Share at pregnancy reveal events** or family gatherings
* **Create audio/video keepsakes** of hearing the heartbeat

HeartBeats™ audio output can be connected to most speakers or recording devices via the headphone jack (check your device for output options).

## Important Second-Trimester Reminder

By weeks 24–28, fetal movement becomes an important health indicator. From this point:

* Regular fetal movement (kick counts) is more clinically meaningful than doppler monitoring alone
* If your baby has been consistently active and movement has suddenly decreased, contact your OB — do not first attempt to reassure yourself with the doppler
* Doppler monitoring is supplementary to movement counting, not a replacement for it

***

**Related:** [How to Use](/fetal-doppler/how-to-use) · [Normal Heart Rates](/fetal-doppler/heartbeat-normal-ranges) · [FAQ](/fetal-doppler/faq)