A more thorough explanation:

Term: In utero
Definition: When a baby is growing inside its mother's womb, it is said to be in utero. This means that the baby is still developing and has not yet been born.
Examples:

• During a routine ultrasound, the doctor was able to see the baby's movements in utero.
• The mother took good care of herself during pregnancy to ensure the health of her child in utero.

These examples illustrate the definition of in utero by showing how it refers to the time when a baby is still inside the mother's womb and has not yet been born.