At 30 to 32 weeks, a fetus has increased central nervous system control over body functions and rhythmic breathing movements. It is still developing lungs and is partially in control of body temperature.
Reviewed By: John D. Jacobson, MD, Department of Obstetrics and Gynecology, Loma Linda University School of Medicine, Loma Linda, CA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.