02/11/2026
It’s not just about a smooth slide…
Ultrasound gel plays a crucial role in creating those extraordinary images of your baby and the science behind it is pretty clever.
Ultrasound uses high-frequency sound waves to create images inside your body.
Air is ultrasound’s worst enemy.
When sound waves encounter materials with very different acoustic properties, much of their energy can be reflected, (in fact more than 99.9% at a tissue–air boundary).
Enter the belly jelly.
Typically made from water, thickening agents and moisture-retaining ingredients, ultrasound gel eliminates tiny air gaps between the probe and your skin.
This creates an effective acoustic connection, allowing sound waves to enter your body and returning echoes to reach the probe.
It’s thick enough to stay put, maintain continuous contact as the probe moves and helps it glide smoothly across your skin.
So that cold blob is backed by beautiful physics and helps us to make the invisible visible for you 🤍