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 Pregnancy week 4 (Fetal growth in week 4)

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   Home >> Parenting >> Pregnancy
Pregnancy weeks  


Note: Information provided on this page is for reference only, growth of baby inside womb depends upon many factor and growth of your baby may differ slightly than indicated below, please seek medical assistance when in doubt.

In this week ...
  • The fertilized egg known as a zygote is implanted in the wall of the uterus and the placenta and umbilical cord begins to form.

  • This week your baby is the size of a full-stop, or a poppy seed. It is still barely visible to naked eye.

  • In this week there is a lot of organization and cell separation in progress and three distinct layers of cells start to form viz. the ectoderm (outer layer), mesoderm (middle layer), and endoderm (inner layer).

  • Ectoderm, the outer layer, will eventually become the baby's skin, eyes, hair, their nervous system, their brain, and even the enamel of their teeth.

  • Mesoderm, the middle layer will become their skeleton, muscles and kidneys, tissues and vascular (blood) system.

  • Endoderm, the layer on the inside will eventually become their internal organs.

  • Once a cell has a specific function, it can't become a different type of cell. Every one is pre-programmed from the start and knows what to do and what it is to become.

  • Towards the end of this week and into next week, a transvaginal ultrasound can show a gestational sac. Yolk sac that helps feed your baby until the placenta is fully functional is appearing.

  • Baby will grow to average length of about 0.1 inch or 2.5 mm Crown to Rump (CR) towards the ends of this week.


◄ Fetal Growth in Previous Week Fetal Growth Next Week ► 

Fetal Growth in ...
Week 1 Week 2 Week 3 Week 4 Week 5 Week 6
Week 7 Week 8 Week 9 Week 10 Week 11 Week 12
Week 13 Week 14 Week 15 Week 16 Week 17 Week 18
Week 19 Week 20 Week 21 Week 22 Week 23 Week 24
Week 25 Week 26 Week 27 Week 28 Week 29 Week 30
Week 31 Week 32 Week 33 Week 34 Week 35 Week 36
Week 37 Week 38 Week 39 Week 40 Beyond 40 weeks

Fetal Growth in ...
1st month 2nd month 3rd month 4th month
5th month 6th month 7th month 8th month
9th month 10th month


Also See:
  Due Date Calculator
  Ovulation Calculator (When is Ovulation)
  Fertility Calculator
  Safe Period Calculator
  Fetal Growth Calculator
  Fetal Size Calculator
  Pregnancy Calendar (Pregnancy Chart)
  Fetal length and weight chart
  Pregnancy Weeks (Pregnancy week by week)
  Pregnancy Months (Pregnancy month by month)
  Pregnancy Trimester
    -  First Trimester
    -  Second Trimester
    -  Third Trimester



  How to get Pregnant
  Pregnancy Overview
  Signs or Symptoms of Pregnancy
  Pregnancy Tests
  When to test for pregnancy
  Embryonic period in human pregnancy
  Menstruation
  What is Ovulation
  When does Ovulation occurs
  What is fertile period
  When is safe period
  IVF (In vitro fertilization)

 

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