Your baby is still very small, but by the end of this week your baby will be 1⁄4 of an inch long.

Over the next few weeks, the embryo grows very quickly, and all the major systems of the body begin to develop. Your baby looks more like a tadpole than a baby at this point. By the end of week 5, Your baby’s skeleton is beginning to form, the brain and spinal cord (the central nervous system) have begun to form. The heart divides into separate chambers and begins to beat at a steady rhythm, and the structures that will become the eyes and ears are forming.

There are still not any changes noticeable to those around you at this time. You may begin to notice more pregnancy symptoms such as morning sickness. About 50% of pregnant women will experience morning sickness. Morning sickness normally begins around the sixth week of pregnancy, and can be experienced in the morning, throughout the day, or in the evening. If morning sickness is so severe that you are constantly throwing up and not keeping anything down, consult with your doctor about the possibility of having hyperemesis gravidarum.

When you’re pregnant, there are lots of foods that you’re advised to avoid, including soft cheese, pâté, and uncooked eggs. Ask your GP or midwife for more advice.