Your baby is about the weight of a large watermelon 3.3kg and measures 50.7cm (head to heel)...
Most of the lanugo is gone as the baby prepares for its final days in the womb.
The lungs are maturing and surfactant, a naturally occurring substance that reduces the surface tension of fluid in the lungs, is increasing.
The brain is still developing rapidly and the skin has become much paler in appearance due to a thick layer of fat beneath the skin. Your baby can't move too much any more as its womb space has become very crowded.
After nine months of growth and development your baby is almost ready to be born.
You could go into labour at any time now so your body is preparing. Although you can’t feel it, your cervix is ripening in preparation for labour. You will notice more frequent and more intense Braxton Hicks contractions. Your uterus is taking up a great deal of space so you will be feeling very uncomfortable.
If this is your first pregnancy you may be worried that you won’t know when labour has started. Be prepared for some false alarms and trust your instincts. It will help to be aware of the signs that can indicate the beginning of labour, such as a ‘show’, which is when the plug of slightly bloody mucus that has been protecting your uterus from infection is discharged from the vagina. A dull pain in your lower back could also indicate that things are about to start. Your waters may break before contractions start, but this is more likely to happen once you are in established labour.
Things for you to consider during week 39 of your pregnancy:
What to expect at week 40 of your pregnancy...