Fetal Development: Week 6
Size
Sweet pea
Length
0.2 in (5 mm)
Weight
Less than 0.04 oz
Trimester
1st
Your baby is now the size of a sweet pea, and their tiny heart has divided into chambers — beating at about 100-160 beats per minute.
Key milestone: The heart divides into chambers. The jaw, cheeks, and chin begin forming.
What's happening this week
At week 6, your baby measures 0.2 in (5 mm) and weighs approximately Less than 0.04 oz — about the size of a Sweet pea. All major organs are forming or have formed, and the foundation for a healthy pregnancy is being established. This rapid growth is why tracking fetal development week by week is so exciting for expecting parents.
How to bond this week
Start talking to your baby even though they can't hear you yet — your voice will become familiar over time. Consider starting daily voice notes with Baby Whispers to build the habit early.
Common questions about fetal development at week 6
Parents at week 6 often ask how their baby is developing and what to expect at the next prenatal visit. Your healthcare provider will monitor growth through fundal height measurements and ultrasounds. Meanwhile, tracking fetal development week by week helps you understand the incredible transformations happening inside.
Looking ahead: what changes at week 7
Next week, your baby's development continues as they grow larger and more complex. Each week builds on the last, and the changes you're noticing now are preparing your baby for the milestones ahead. Baby Whispers evolves with each week too — our daily voice notes reflect your baby's changing world.
Prenatal Care at Week 6
Depending on where you are in your pregnancy, your prenatal appointments will focus on different aspects of care. Early appointments confirm the pregnancy, establish your due date, and include blood work, urine tests, and sometimes an early ultrasound. Your provider will discuss prenatal vitamins, lifestyle adjustments, and what to expect in the coming weeks.
Your baby at week 6 — the size of a Sweet pea — is developing exactly as expected. Tracking fetal development week by week helps you feel connected to the incredible process unfolding inside you.
Hear your baby's voice at week 6
Imagine waking up to a voice note that sounds like your Sweet pea-sized little one.
Try free →