Development – Week 30

Week 30 –  Bone marrow starts producing RBCs!

You are at the end of the 7th month now. All the 5 senses are present in the baby now. The baby’s reflexes and sensory organs are in full swing, though little more maturation is still needed. The little one now weighs 1200-1500grams and is the size of a cabbage.

So, let’s summarize the main events that you will see this week:

One significant milestone that happens this week is that the bone marrow starts producing RBC’s. This helps the baby survive after birth.

The brain cells keep growing and gyri and sulci (depression and elevations) on the brain is seen.

The baby’s sense organs are all developed. Further maturation occurs over the weeks to come.

There is little room to move around in the womb. As the weeks pass by, space keeps getting lesser.

The little one is either in a transverse (lying sideways) or breech (feet down) position during week 30.

The “white fat” layer starts depositing under the skin and the baby looks plumper and the skin looks supple. The eyelashes are also fully formed, and the nails occupy the nail beds.

The baby’s kicks get stronger and at times hurt the mother. This is a normal sign.


The baby in the third trimester continues depositing calcium to the growing bones and teeth.

Developmental Milestones Summary:

RBCs are formed by the bone marrow. The development of all the sense organs is almost done. The baby prepares to exit the womb.

 Ultrasound findings:

The ultrasound shows numerous folds in the brain (depicting its growth). The skin is clear, and the baby almost looks like what it will be when it is born.

Fetal Size:

The baby now measures 16 inches from crown to rump (CRL).

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