4 Weeks Pregnant

4 Weeks size comparison

Baby is the size of a

poppy seed

Baby this Week

  • The embryo is formed.
  • These three primitive cell layers will generate every organ and tissue in your baby’s body.
  • Around the end of this week, primitive blood vessels and circulatory system are formed.
5 Weeks pregnant illustration

How Big is Baby?

Baby is 0.04 inches long (0.1 cm)
(Very hard to estimate weight at this stage)
Baby weighs 0oz (0 grams)

*Metrics above are estimates of baby at 4 weeks

Baby at 5 weeks in womb

Your Developments

  • Missing your period this week may be your first real sign of pregnancy.
  • Time for a pregnancy test as results are more likely to be reliable now. Make sure to follow the manufacturer’s instructions to avoid an incorrect result.

Pregnancy To Do’s

  • Find a practitioner to assist you during pregnancy. A obstetrician-gynecologist or OB-GYN is the preferred option for many pregnant women. A family physician, midwife or doula make great additions also.

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