We invite you to a fascinating journey through the creation of human life with these spectacular images of conception and pregnancy week by week. We can see the first moments since the egg is fertilized through the early stages of embryo formation until the last weeks of pregnancy.
The photographs were taken over 12 years by the famous Swedish photographer Lennart Nilsson using an endoscope complemented with those of The Multi-Dimensional Human Embryo project with three-dimensional images recreated from magnetic resonance images.
Fallopian tube 
The journey of a sperm 
In Babies and more Pregnancy week by week: from conception to birth
Sperm in front of the ovule Week 4 of pregnancy
The sperm penetrates the egg 
The embryo nests in the walls of the uterus 
The heart begins to develop in the embryo 
The brain also begins to develop in the embryo 
You can already see where the baby's eyes and mouth will be located Week 5 of pregnancy
Week 5 of pregnancy Week 6 of pregnancy
Week 6 of pregnancy Week 7 of pregnancy
Week 7 of pregnancy Week 8 of pregnancy
Week 8 of pregnancy Week 9 of pregnancy
Week 9 of pregnancy (with amniotic sac) Week 10 of pregnancy
Week 10 of pregnancy Week 11 of pregnancy
Week 11 of pregnancy Week 12 of pregnancy
Week 12 of pregnancy Week 13 of pregnancy
Week 13 of pregnancy Week 14 of pregnancy
Week 14 of pregnancy 15 week of pregnancy
15 week of pregnancy Week 16 of pregnancy
Week 16 of pregnancy Week 17 of pregnancy
Week 17 of pregnancy 18th week of pregnancy
18th week of pregnancy Week 19 of pregnancy
Week 19 of pregnancy 20th week of pregnancy
20th week of pregnancy Week 21 of pregnancy
Week 21 of pregnancy 
Week 22 of pregnancy Week 23 of pregnancy
Week 23 of pregnancy 24 week of pregnancy
24 week of pregnancy Week 26 of pregnancy
Week 26 of pregnancy 27th week of pregnancy
27th week of pregnancy 28th week of pregnancy
28th week of pregnancy Week 29 of pregnancy
Week 29 of pregnancy 30th week of pregnancy
30th week of pregnancy Week 31 of pregnancy
Week 31 of pregnancy Week 36 of pregnancy
Week 36 of pregnancy Photos Lennart Nilsson, Bradley Smith in The Multi-Dimensional Human Embryo and National Geographic Channel
In Babies and more | Pregnancy week by week: from conception to birth
