At week 16, the fetus reaches a length of about 6 inches, makes active movements, and makes sucking motions with the mouth.
Review Date 8/26/2017
Updated by: Peter J Chen, MD, FACOG, Associate Professor of OBGYN at Cooper Medical School at Rowan University, Camden, NJ. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.