Watch your mouth around your unborn child — he or she could be listening in. Babies can pick up language skills while they’re still in the womb, Finnish researchers say.

Fetuses exposed to fake words after week 29 in utero were able to distinguish them after being born, according to new research in the Proceedings of the National Academy of Sciences.

“Prenatal experiences have a remarkable influence on the brain’s auditory discrimination accuracy, which may support, for example, language acquisition during infancy,” the authors wrote.

As revealed by the allure of the so-called Mozart Effect — the idea that exposing the fetus to classical music earns kids extra IQ points in spatial reasoning down the line — parents are constantly looking for ways to give their children an intelligence advantage.

That’s even if the research their parenting tactics are based on is too narrow to draw such broad conclusions or remains under question.

Nonetheless, scientists have discovered plenty of evidence that what’s heard in utero can make a lasting impression.

Fetuses respond differently to native and nonnative vowels, and newborns cry with their native language prosody.

The findings could mean it’s possible to give babies a little language leg-up before they ever say a word — particularly the children who may need it most.

“It might be possible to support early auditory development and potentially compensate for difficulties of genetic nature, such as language impairment or dyslexia,” the authors wrote.