In the next few weeks your baby will double in size from its present weight of three ounces. At 16 weeks pregnant she is the size of an avocado measuring nearly 5 inches (12cm) from head to buttocks and weighs about 3.5 ounces (100 g).
The limbs are much more developed by now and the eyes and ears have almost arrived at their correct positions on your baby's head. These tiny ears can now pick up your voice and hear what you are saying.
Eyebrows, lashes and hair are now starting to fill in and toenails are forming. Internally your baby's heart is pumping blood at a rate of 50 pints a day and this amount will increase daily from now on.
You may start to feel tiny movements as there is plenty of room for your foetus to somersault around the uterus. Sometimes babies will even grasp at the umbilical cord with their tiny hands.
At 16 weeks pregnant your uterus has reached halfway from your pubic bone to your belly button and the supporting ligaments are thickening and strengthening in preparation for your baby's growth.
This is the 'feel-good' time of your pregnancy as nausea has subsided, mood swings have lessened and your skin and hair are nourished and glowing.
You will probably be experiencing a glorious sense of well-being and now is the perfect time to get away on a holiday or spend some quality time with your partner.
Many women will feel their babies moving for the first time this week but others may not be conscious of it for several more weeks.
These early movements can be easy to miss especially in your first pregnancy as they are no more than gentle flutters. Don't worry because as your baby grows there will be no mistaking her activities!
What to expect at week 17 of your pregnancy...