How your baby's growing

Fetal development week by week

computer-generated image of a fallopian tube with many sperm trying to enter an egg
Conception: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fertilised egg at 4 weeks with yolk sac and amniotic sac
4 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of an embryo at five weeks with amniotic sac, yolk sac and umbilical cord
5 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of an embryo at six weeks, with arm and leg buds
6 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of an embryo at seven weeks, with heart and tailbone
7 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of an embryo at eight weeks with arms, legs, an eye and a mouth
8 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of an embryo at nine weeks, with umbilical cord, ear and growing brain
9 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 10 weeks, with fingers and toes and facial features
10 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of embryo at 11 weeks with clear blood vessels in the umbilical cord
11 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 12 weeks in amniotic sac with umbilical cord
12 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 13 weeks in amniotic sac with umbilical cord
13 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 14 weeks frowning in amniotic sac with umbilical cord
14 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 15 weeks in amniotic sac with umbilical cord
15 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of head, shoulders and arms of a fetus at 16 weeks
16 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 17 weeks in amniotic sac with umbilical cord
17 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of head, shoulders and torso of a fetus at 18 weeks
18 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 19 weeks, with small amount of hair on head
19 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 20 weeks sucking thumb
20 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 21 weeks with close-up view of face and hands
21 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 22 weeks with umbilical cord
22 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 23 weeks with reddish-colour skin
23 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 24 weeks with raised eyebrows and closed eyes
24 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 25 weeks with umbilical cord
25 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 26 weeks with tiny veins shown under the skin
26 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of head and torso of a fetus at 27 weeks with open eyes
27 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of the head and torso of a fetus at 28 weeks with slightly chubby cheeks
28 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of fetus at 29 weeks with hair on head
29 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of fetus at 30 weeks with head turned towards user and hand raised
30 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 31 weeks with umbilical cord and arm raised in front of mouth
31 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of fetus at 32 weeks with hair on head and umbilical cord
32 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 33 weeks with umbilical cord
33 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 34 weeks with dark hair on head
34 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of fetus at 35 weeks with umbilical cord
35 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 36 weeks with pink skin and open mouth
36 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 37 weeks with close up of face with smile and hair on head
37 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 38 weeks with dark hair on head and umbilical cord
38 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 39 weeks with dark hair on head and umbilical cord
39 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
] computer-generated image of a fetus at 40 weeks with dark hair on head and umbilical cord
40 weeks: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
Advertisement | page continues below

Latest in how your baby's growing

illustration of a baby inside the uterus
go to video page
Your baby’s senses during pregnancy (video)
illustration of a baby in the uterus at 37 weeks of pregnancy
go to video page
Inside pregnancy: weeks 28 to 37 (video)
illustration of a baby in the womb at 20 weeks of pregnancy
go to video page
Inside pregnancy: weeks 15 to 20 (video)
illustration of an embryo in the womb at 9 weeks of pregnancy
go to video page
Inside pregnancy: weeks 1 to 9 (video)
illustration of a baby in the uterus at 14 weeks of pregnancy
go to video page
Inside pregnancy: weeks 10 to 14 (video)
illustration of a baby in the uterus at 27 weeks of pregnancy
go to video page
Inside pregnancy: weeks 21 to 27 (video)
computer-generated image of a fetus at 38 weeks with dark hair on head and umbilical cord
38 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist
computer-generated image of a fetus at 37 weeks with close up of face with smile and hair on head
37 weeks pregnant: fetal development
Reviewed by Joseph Aquilina, Consultant obstetrician and gynaecologist

Community

  • October 2023 Birth Club
    Feelings about changing body.. possible tw
    By Mismolly
    How do I stop myself from getting down about how my body looks 😭 my body changed a lot after my 3rd due to where my c section scar is and how big it was. Now when my belly gets bigger it just hangs at the bottom and it’s really affecting my mental health. I know that may sound stupid as obviously g
    30-03-23 by Mismolly
    Number of comments5
    replied with hug
    3
  • Getting pregnant
    Ttc after late loss (second trimester)
    By Liv2019
    Hi all, just looking for experiences on getting period and fertility back after loss. I found out my baby had died at my 22 week scan and delivered last Sunday. My cervix is back closed and bleeding has stopped, except I have a little brown discharge still, which I have been told is normal. I am
    23-10-23 by Liv2019
    Number of comments9
    replied with hug
    1
  • April 2024 Birth Club
    Congratulations and welcome! Please read
    By BabyCenter_member
    Welcome to your Birth Club. Getting your BFP is exciting and life-changing. You are bound to have questions and BabyCenter has the answers. Our pregnancy articles such as easing morning sickness, meeting your midwife and how your baby is growing are written by experts for you and cover every aspe
    21-04-23
    Number of comments0
    replied with hug
    1
Go to Community
Track your pregnancy on our free #1 pregnancy & baby app
phone with BabyCenter app
My pregnancy week by week
2
weeks pregnant
Fertilisation illustration
3
weeks pregnant
Implantation illustration
4
weeks pregnant
poppy seeds illustration
5
weeks pregnant
seasame illustration
6
weeks pregnant
lentil illustration
7
weeks pregnant
blueberry illustration
8
weeks pregnant
kidney bean illustration
9
weeks pregnant
grape illustration
10
weeks pregnant
kumquat illustration
11
weeks pregnant
fig illustration
12
weeks pregnant
lime illustration
13
weeks pregnant
pea pod illustration
14
weeks pregnant
lemon illustration
15
weeks pregnant
apple illustration
16
weeks pregnant
avocado illustration
17
weeks pregnant
turnip illustration
18
weeks pregnant
capsicum illustration
19
weeks pregnant
tomato illustration
20
weeks pregnant
banana illustration
21
weeks pregnant
carrot illustration
22
weeks pregnant
cucumber illustration
23
weeks pregnant
mango illustration
24
weeks pregnant
corn illustration
25
weeks pregnant
swede illustration
26
weeks pregnant
red cabbage illustration
27
weeks pregnant
cauliflower illustration
28
weeks pregnant
eggplant illustration
29
weeks pregnant
butternut illustration
30
weeks pregnant
cabbage illustration
31
weeks pregnant
coconut illustration
32
weeks pregnant
celery illustration
33
weeks pregnant
pineapple illustration
34
weeks pregnant
rockmelon illustration
35
weeks pregnant
honeydew illustration
36
weeks pregnant
lettuce illustration
37
weeks pregnant
rainbow chard illustration
38
weeks pregnant
leek illustration
39
weeks pregnant
watermelon illustration
40
weeks pregnant
pumpkin illustration
41
weeks pregnant
newborn illustration
Advertisement
Advertisement