The short version
- Dopplers are for reassurance, not diagnosis. They never replace antenatal appointments or clinical advice.
- Start when results are more predictable: most parents have success between 9–12 weeks; consistency improves as pregnancy progresses.
- Practical safety markers: FDA 510(k) or CE mark, clear instructions, and a 2-MHz waterproof probe.
- Buy for clarity: steady AVG BPM, back-lit display, clean audio with headphone jack, effective noise reduction.
- Use briefly and sensibly. If no heartbeat in 1–2 minutes, pause and try later; follow your clinician’s guidance for concerns.