Week Changes
1-4 The fertilized egg implants in the uterine lining, and the placenta begins to form. The embryo is the size of a poppy seed.
5-8 The embryo becomes a fetus and begins to develop its major organs and body systems. The heartbeat can be heard on an ultrasound.
9-12 The fetus grows rapidly and starts to move. The mother may begin to feel pregnant, with symptoms such as morning sickness and breast tenderness.
13-16 The fetus continues to grow and develop. The bones and muscles start to form, and the face becomes more recognizable.
17-20 The fetus is now fully formed, with all major organs and body systems present. The senses are developing, and the fetus can hear and respond to sound.
21-24 The fetus continues to grow and mature. The skin becomes smoother and the eyebrows and eyelashes are visible.
25-28 The fetus is now about the size of a rutabaga. The respiratory system is fully developed, and the fetus practices breathing movements.
29-32 The fetus is now about the size of a coconut. The skin becomes less transparent and the bones are fully formed.
33-36 The fetus is now about the size of a papaya. The muscles continue to mature and the bones are harder.
37-40 The fetus is now fully developed and ready for birth. The skin is smooth and the lanugo, a fine downy hair, disappears.






The fetus is now fully developed and ready for birth. The skin is smooth and the lanugo, a fine downy hair, disappears.
Week Changes
1-4 The fertilized egg implants in the uterine lining, and the placenta begins to form. The embryo is the size of a poppy seed.
5-8 The embryo becomes a fetus and begins to develop its major organs and body systems. The heartbeat can be heard on an ultrasound.
9-12 The fetus grows rapidly and starts to move. The mother may begin to feel pregnant, with symptoms such as morning sickness and breast tenderness.
13-16 The fetus continues to grow and develop. The bones and muscles start to form, and the face becomes more recognizable.
17-20 The fetus is now fully formed, with all major organs and body systems present. The senses are developing, and the fetus can hear and respond to sound.
21-24 The fetus continues to grow and mature. The skin becomes smoother and the eyebrows and eyelashes are visible.
25-28 The fetus is now about the size of a rutabaga. The respiratory system is fully developed, and the fetus practices breathing movements.
29-32 The fetus is now about the size of a coconut. The skin becomes less transparent and the bones are fully formed.
33-36 The fetus is now about the size of a papaya. The muscles continue to mature and the bones are harder.
37-40






Week Changes
1-4 The fertilized egg implants in the uterine lining, and the placenta begins to form. The embryo is the size of a poppy seed.
5-8 The embryo becomes a fetus and begins to develop its major organs and body systems. The heartbeat can be heard on an ultrasound.
9-12 The fetus grows rapidly and starts to move. The mother may begin to feel pregnant, with symptoms such as morning sickness and breast tenderness.
13-16 The fetus continues to grow and develop. The bones and muscles start to form, and the face becomes more recognizable.
17-20 The fetus is now fully formed, with all major organs and body systems present. The senses are developing, and the fetus can hear and respond to sound.
21-24 The fetus continues to grow and mature. The skin becomes smoother and the eyebrows and eyelashes are visible.
25 The fetus is now about the size of a rutabaga. The respiratory system is fully developed, and the fetus practices breathing movements.
29-32 The fetus is now about the size of a coconut. The skin becomes less transparent and the bones are fully formed.
33-36 The fetus is now about the size of a papaya. The muscles continue to mature and the bones are harder.
37-40 The fetus is now fully developed and ready for birth. The skin is smooth and the lanugo, a fine downy hair, disappears.