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Mother helps set fetal biological clock (Level A1) — A woman sitting on the floor holding a clock

Mother helps set fetal biological clockCEFR A1

15 Apr 2026

LevelA1
A2
B1
B2

Adapted from Washington U. in St. Louis, Futurity • CC BY 4.0

Photo by Maria Kovalets, Unsplash

Level A1 – Beginner
2 min
73 words
  • A mother helps set the baby's clock.
  • This happens while the baby is in the womb.
  • The clock controls sleep and daily body functions.
  • Scientists studied this in the laboratory.
  • They watched signals that show the clock working.
  • Baby clocks matched the mother's day-night routine.
  • No clock activity in some fetuses linked to problems.
  • Keeping regular daily rhythms may help pregnancy.
  • Many people see light at night and this can disturb rhythms.

Difficult words

  • womb — place inside a woman where the baby grows
  • fetus — a baby before birth inside the womb
    fetuses
  • rhythm — a regular pattern of activity over time
    rhythms
  • signal — a sign that gives information or message
    signals
  • pregnancy — the time when a woman has a baby inside
  • disturb — to make a pattern not normal or regular

Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.

Discussion questions

  • Do you see light at night?
  • Do you have a regular daily routine?
  • Do you try to sleep at the same time each day?

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