He's getting big!!!!

Fetal development - 17 weeks pregnant

Written for Canada
Approved by the BabyCenter Canada Medical Advisory Board

Your baby is now nearly 5.5 inches/ 13 centimetres long from crown to rump and weighs approximately 5 ounces/ 140 grams. Her skeleton is mostly rubbery cartilage, which will harden later. A protective substance called myelin slowly begins to wrap around the spinal cord.

With the help of a special stethoscope, you can now hear your baby's heartbeat. There's almost nothing more comforting or exciting than hearing your baby's heartbeat galloping along. On days when you're worried about how your pregnancy is progressing, hearing the heartbeat lets you know that your baby's developing and growing. For times when boredom strikes and you feel as if you'll be pregnant forever, it can be a pleasant reminder of what will come at the end of 40 weeks of waiting.

Your growing uterus has shifted your centre of gravity and you've probably been feeling a bit off-kilter. Be careful and wear low-heeled shoes. Finding it hard to settle when you go to bed? Check our tips for sleep in the second trimester.