Skip Navigation

Little One Pregnancy Place  

Movie Theater

Blood Cells and Bone Marrow


 

3 months, 3 weeks

From The Biology of Prenatal Development.Buy Now

Script: By 15 weeks, blood-forming stem cells arrive and multiply in the bone marrow. Most blood cell formation will occur here.

All ages referenced to fertilization, not last menstrual period. One month = 4 weeks.
 <  Previous  See Snapshots  Next  > 
Blood Cells and Bone Marrow
Blood Cells and Bone Marrow
( 3 months, 3 weeks)
Quickening
Quickening
( 4 months)
Movement
Movement
( 4 months)
Hormonal Stress Response
Hormonal Stress Response
( 4 months, 1 week)
Vernix Caseosa
Vernix Caseosa
( 4 months, 1 week)
Bronchial Tree
Bronchial Tree
( 4 months, 2 weeks)
Previous Set Previous Movie Next Set Next Movie
Help give babies a healthy start and a healthy future. Donate now.
When does health begin? Find out now.