Estimate your baby’s delivery date

The calculator on this page can help you work out when you might expect your baby to arrive.

Due Date Calculator
When did your last period start?
Generally, how long are your cycles?
Calculate your due date
Your baby is likely to be born on or around*
*Only your physician can accurately determine your due date or the date of your conception based on his/her knowledge of your complete medical condition.
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Your developing baby

Learn more about how your baby is growing and developing
Weeks of Pregnancy Fetal Development
Weeks 1-8
  • Placenta begins to form.
  • The brain and spinal cord begin to form.
  • The tissues that will form the heart begin to beat. The heartbeat can be detected with ultrasound at around 6 weeks of pregnancy.
  • Buds for limbs, with paddle-like hands and feet, appear.
  • The eyes, ears and nose begin to develop. Eyelids form but remain closed.
  • The genitals begin to develop.
  • By the end of the eighth week, all major organs and body systems have begun to develop.
Weeks 9-12
  • Buds for future teeth appear.
  • Fingers and toes start to form. Soft nails begin to form.
  • Bones and muscles begin to grow.
  • The intestines begin to form.
  • The backbone is soft and can flex.
  • The skin is thin and transparent.
  • The hands are more developed than the feet.
  • The arms are longer than the legs.
Weeks 13-16
  • Arms and legs can flex.
  • External sex organs are formed.
  • The outer ear begins to develop.
  • The fetus can swallow and hear.
  • The neck is formed.
  • Kidneys are functioning and begin to produce urine.
Weeks 17-20
  • The sucking reflex develops. If the hand floats to the mouth, the baby may suck their thumb.
  • The skin is wrinkled, and the body is covered with a waxy coating (vernix) and fine hair (lanugo).
  • The baby is more active. You may be able to feel your baby move.
  • The baby sleeps and wakes regularly.
  • Nails grow to the tips of the fingers.
  • The gallbladder begins producing bile, which is needed to digest nutrients.
  • In females, the eggs have formed in the ovaries. In males, the testes have begun to descend.
  • It may be possible to tell the sex of the fetus on an ultrasound exam.
Weeks 21-24
  • The baby may hiccup.
  • The brain is rapidly developing.
  • Tear ducts are developing.
  • Finger and toe prints can be seen.
  • The lungs are fully formed but not yet ready to function outside of the uterus.
Weeks 25-28
  • The eyes can open and close and sense changes in light.
  • The baby kicks and stretches.
  • The baby can make grasping motions and responds to sound.
  • Lung cells begin to make a substance that will enable breathing.
Weeks 29-32
  • With its major development finished, the baby gains weight very quickly.
  • Bones harden, but the skull remains soft and flexible for delivery.
  • The different regions of the brain continue to form.
  • Hair on the head starts to grow and the fine hair (lanugo) begins to disappear.
Weeks 33-36
  • The baby usually turns into a head-down position for birth.
  • The brain continues to develop.
  • The skin is less wrinkled.
  • The lungs are maturing and getting ready to work outside of the uterus.
  • Sleeping patterns develop.
Weeks 37-40
  • The baby drops lower into the pelvis.
  • More fat accumulates, especially around the elbows, knees and shoulders.
  • The baby gains about half a pound per week during this last month of pregnancy.