Standing in the background, Meghan had her hands resting below her tummy, when suddenly she grabs her growing bub, closes her eyes and appears to take a breath.
Fans on social media were quick to point out the Duchess was reacting to a movement from her baby.
The video has garnered hundreds of comments from adoring fans.
"That baby is playing polo in Meghan’s belly," one wrote.
Another added, "That blink she gave tells us that was a kick kick!!"
"Baby Sussex is full of energy!! Look how he/she kicks mummy hard and Meghan close her eyes."
Baby Sussex is due next year.