At 26 to 30 weeks, a fetus is rapidly developing its brain controls and some body functions. The fetus has eyelids which open and close and has a rapidly developing respiratory system.
Review Date 6/30/2019
Updated by: John D. Jacobson, MD, Professor of Obstetrics and Gynecology, Loma Linda University School of Medicine, Loma Linda Center for Fertility, Loma Linda, CA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.