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](https://www.duringpregnancy.com/images/guide/draw/4weekspregnant.jpg)
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](https://www.duringpregnancy.com/images/guide/baby-in-womb/6.png)
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.
![](https://www.duringpregnancy.com/wp-content/uploads/4weeks-womb-grad.jpg)