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Second trimester

Week 20 of pregnancy

Your baby is the size of a banana and you are halfway there. From this week the baby is measured from head to heel.

Your baby is the size of a banana

Length, head to heel
≈ 25.6 cm
Weight
≈ 300 g

Your baby this week

  • The baby swallows amniotic fluid, and meconium, the first poo, starts to form in the gut.
  • It has regular times of sleeping and waking and may be more active when you rest.
  • It may suck its thumb and grab the umbilical cord.

Your body this week

  • You are halfway through the pregnancy. The top of your womb is near your belly button.
  • The baby’s movements become clearer.
  • Stretch marks may appear on your tummy, breasts or thighs; they often fade after the birth.

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Read more for this stage

General information written by the mam.al editors. Every pregnancy is different and sizes are averages; it does not replace advice from your doctor or midwife. Sources include the NHS week-by-week guide to pregnancy. NHS. Contains public sector information licensed under the Open Government Licence v3.0.