21 WEEKS PREGNANT

Eyebrows and eyelids are fully formed

Baby this week: about 26.7 cm — head to heel · about 360 g

≈ 26.7 cm — about the size of a carrot

Illustration enlarged for clarity — the amber marker shows true relative size

Your baby this week

  • Eyebrows and eyelids are now fully formed, though the eyes stay closed
  • The digestive system is maturing enough to absorb some sugar from swallowed amniotic fluid
  • Movement patterns are becoming more noticeable and may follow a rhythm
  • Bone marrow is now producing blood cells, taking over from the liver and spleen

Your body this week

  • Increased appetite is common as the body works harder to support growth
  • Varicose veins or swollen ankles can start appearing as circulation changes

This week's tip: Elevating your feet when sitting and avoiding long periods of standing can help with leg swelling.

When to get help now

Contact your maternity unit now, even at night, if your baby is moving less than usual or the pattern has changed, you have any vaginal bleeding, fluid leaks from your vagina, you have regular or painful contractions before 37 weeks, or you have a severe headache, vision changes, pain just below the ribs or sudden swelling of the face, hands or feet. Do not wait until the next day.

Want the bigger picture — organ development, nutrition, scans and warning signs for this stage? See month 5: The month of first kicks.

Sizes and milestones are typical ranges — every pregnancy runs on its own clock. Educational content; your prenatal care team's guidance always comes first.