Fetus (12 weeks old):

A fetus at 12 weeks can make a fist and suck its thumb.
- Reviewed last on: 10/19/2007
- Deirdre O’Reilly, MD, MPH, Neonatologist, Division of Newborn Medicine, Children’s Hospital Boston and Instructor in Pediatrics, Harvard Medical School, Boston, Massachusetts. Review Provided by VeriMed Healthcare Network.