Friday, 5 February 2016

Fetal development week by week

Follow your baby's development from a tiny mass of cells through to a fully developed baby. Our illustrations show how your baby is growing inside your uterus, while our Inside pregnancy videos take a 3D animated look at a baby from conception to labour and birth. And see the whole nine months in one timeline!


Fetal development diagram - conception

Conception

See what happens inside you during the conception process.

  • Fertilisation
  • How BabyCentre works out how pregnant you are
  • Video: Inside pregnancy - a 3D animated look at a baby from weeks one to nine
Fetal development diagram - one month

One month pregnant

Your baby is an embryo consisting of two layers of cells from which
 all her organs and body parts will develop. 

  • 4 weeks pregnant
  • 5 weeks pregnant
  • 6 weeks pregnant
  • 7 weeks pregnant
  • Twins - 3 weeks pregnant
  • Twins - 4 weeks pregnant
  • Video: Inside pregnancy - weeks 1 to 9

Fetal development diagram - two months

Two months pregnant

Your baby is now about the size of a kidney bean and is constantly
 moving. He has distinct, slightly webbed fingers

  • 8 weeks pregnant
  • 9 weeks pregnant
  • 10 weeks pregnant
  • 11 weeks pregnant
  • 12 weeks pregnant
  • Twins - 8 weeks pregnant
  • Twins - 12 weeks pregnant
  • Video: Inside pregnancy - weeks 10 to 14

Fetal development diagram - three months

Three months pregnant

By now your baby is around 7 to 8 centimeters (3 inches) long
 and weighs about the same as a pea pod. Her tiny,
 unique fingerprints are now in place.

  • 13 weeks pregnant
  • 14 weeks pregnant
  • 15 weeks pregnant
  • 16 weeks pregnant
  • Twins - 16 weeks pregnant
  • Video: Inside pregnancy - weeks 10 to 14

Fetal development diagram - four months

Four months pregnant

Your baby is now about 13cm (5.5in) long and weighs 140g
(5oz). His skeleton is starting to harden from rubbery cartilage
to bone.

  • 17 weeks pregnant
  • 18 weeks pregnant
  • 19 weeks pregnant
  • 20 weeks pregnant
  • Twins - 20 weeks pregnant
  • Video: Inside pregnancy - weeks 15 to 20

Fetal development diagram - five months

Five months pregnant

Eyebrows and eyelids are now in place. Your baby would
now be more than 27cm (10.5in) long if you stretched out her legs. 

  • 21 weeks pregnant
  • 22 weeks pregnant
  • 23 weeks pregnant
  • 24 weeks pregnant
  • Twins - 24 weeks pregnant
  • Video: Inside pregnancy - weeks 21 to 27

Fetal development diagram - six months

Six months pregnant

Your baby weighs about a 660g (1.5lb). His wrinkled
 skin is starting to smooth out as he puts on baby fat. 

  • 25 weeks pregnant
  • 26 weeks pregnant
  • 27 weeks pregnant
  • 28 weeks pregnant
  • 29 weeks pregnant
  • Twins - 28 weeks pregnant
  • Video: Inside pregnancy - weeks 21 to 27

Fetal development diagram - seven months

Seven months pregnant

By now, your baby is more than 40cm (15in) long. She can open and close her eyes and probably see what's around her.

  • 30 weeks pregnant
  • 31 weeks pregnant
  • 32 weeks pregnant
  • 33 weeks pregnant
  • Twins - 32 weeks pregnant
  • Video: Inside pregnancy - weeks 28 to 37

Fetal development diagram - eight months

Eight months pregnant

Your baby now weighs about 2.2kg (4.7lb). His layers of fat are filling him out, making him rounder, and his lungs are well developed.

  • 34 weeks pregnant
  • 35 weeks pregnant
  • 36 weeks pregnant
  • 37 weeks pregnant
  • 38 weeks pregnant
  • Twins - 36 weeks pregnant
  • Video: Inside pregnancy - weeks 28 to 37

Fetal development diagram - nine months

Nine months pregnant

Your baby is almost due. At birth, the average baby is
 more than 51cm (20.5in) long from head to toe and
weighs approximately 3.4kg (7.5lb), but babies vary
widely in size at this stage.

  • 39 weeks pregnant
  • 40 weeks pregnant
  • Video: Inside pregnancy, a 3D animated look at the stages
  •  of labour from contractions to birth
ultrasound scan

Month by month with ultrasound images

See our summary of how your baby is developing from two
 months. Within each month, interactive 3D ultrasound
images give you an idea of how your baby may look.

  • 2 months pregnant
  • 3 months pregnant
  • 4 months pregnant
  • 5 months pregnant
  • 6 months pregnant
  • 7 months pregnant
  • 8 months pregnant
  • 9 months pregnant


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