Baby Size
Week 4

Your Baby is the Size of a Poppy Seed

Week 4

Poppy Seed

Length

0.1 cm / 0.0 in

Weight

< 1 g

Your embryo is the size of a poppy seed and has just implanted into the uterine wall.

Development at Week 4

At 4 weeks, the fertilized egg has successfully implanted in your uterus and is now called an embryo. The amniotic sac and yolk sac are beginning to form, which will nourish and protect your baby throughout the pregnancy. This is the week most home pregnancy tests can first detect the hCG hormone in your urine.

Next week

At week 5, your baby will be the size of a Sesame Seed.
See Week 5

Keep Track of Your Pregnancy Journey

Week-by-week baby development
Baby kick counter and contraction timer
Daily duas and dhikr for pregnancy
Download on App Store
Get it on Google Play