
Length
39.9 cm
Weight
1.319 kg
Size
Cabbage
Week 30
Your Baby is the Size of a Cabbage
Baby's brain is getting bigger
Also growing at a quick pace these days? Baby's brain. Until now, its surface was smooth — but now, your fetus' brain is taking on those characteristic grooves and indentations.
The reason for the different appearance: Those wrinkles allow for an increased amount of brain tissue — a necessary change as your baby prepares to develop street smarts for life outside your womb.
Lanugo is disappearing
Now that baby’s brain and new fat cells are regulating body temperature, the lanugo — that soft, downy hair covering your little bean's body — is beginning to disappear.
No need for that furry coat anymore! But you may see a few leftover strands of fur on your newborn's back and shoulders when she’s born.
Bone marrow is making red blood cells
Another big change at 30 weeks pregnant: Your baby's bone marrow has completely taken over production of red blood cells — before, tissue groups and then the spleen took care of producing the blood cells. This is an important step for your baby because it means she'll be better able to thrive on her own once she's born.
The Mutlu Anne app is with you every step of the way on your pregnancy journey.
Thanks for reading.
This Week's Highlights

Wrinkly baby brain
The surface of your baby’s brain begins to crinkle — those wrinkles are called convolutions — so that it can hold more brain cells.

Hold on tight!
Your baby’s hands are now fully formed and fingernails are growing. In ultrasounds, you may catch baby grabbing a foot.

Do your kick counts!
Your growing baby's quarters keep getting tighter, but you'll still feel movement every day. So don't forget those kick counts!
Mutlu Anne
Pregnancy Tracker
Your trusted companion throughout your pregnancy journey. Get personalized support from conception to birth.
Quick Links
Stay Updated
Subscribe to get pregnancy tips and app updates delivered to your inbox.
Secure
Trusted
4.9 Rating
© 2026 Mutlu Anne. All rights reserved.
Made with
for moms