Fetal Development: Week 30
Size
Large cabbage
Length
10.8 in (27.4 cm)
Weight
2.7 lb (1.25 kg)
Trimester
3rd
At 30 weeks, your baby is the size of a large cabbage. The bone marrow is now producing red blood cells, and the brain is developing the characteristic folds and grooves.
Key milestone: The baby's bone marrow takes over red blood cell production. The brain continues growing folds and grooves.
What's happening this week
At week 30, your baby measures 10.8 in (27.4 cm) and weighs approximately 2.7 lb (1.25 kg) — about the size of a Large cabbage. In the final stretch, your baby is putting on weight and maturing vital systems in preparation for birth. This rapid growth is why tracking fetal development week by week is so exciting for expecting parents.
How to bond this week
Your baby recognizes your voice and may respond to it with movement. Keep talking, and let Baby Whispers add a daily voice note that sounds like your baby talking back.
Common questions about fetal development at week 30
Parents at week 30 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 31
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 30
Depending on where you are in your pregnancy, your prenatal appointments will focus on different aspects of care. Late-pregnancy appointments become more frequent — every 2-4 weeks until week 36, then weekly. Your provider will check the baby's position, your cervix, and discuss your birth plan and signs of labor.
Your baby at week 30 — the size of a Large cabbage — 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 30
Imagine waking up to a voice note that sounds like your Large cabbage-sized little one.
Try free →