Timeline By 1681557 Period: Oct 20, 1990 to Oct 20, 2080 Timeline Period: Jan 20, 1997 to Jan 24, 1997 Beggining and Ending of Zygote Period: Jan 28, 1997 to Mar 28, 1997 Beggining and Ending of Embryo Feb 20, 1997 Heart beats regularly. Eyes and ears begin to form. Mar 20, 1997 Heart develops right and left chambers. Period: Mar 28, 1997 to Oct 20, 1998 Begginging and ending of fetus Jun 20, 1997 Bones are visible. Heartbeat can be heard with a stethoscope. Jul 20, 1997 Fingerprints form. Aug 20, 1997 Eyelids can open and weight can be up to 6.6 pounds. Jan 20, 1998 A baby can hold its head up and reach for objects. Oct 20, 1998 When I was born my brother was 2 years old. Period: Oct 20, 1998 to Oct 20, 2000 Begginging and ending of infancy May 20, 1999 Infant begins to crawl. Feb 20, 2000 1. When I was 2 years old I busted open my head falling down stairs. Period: Oct 20, 2000 to Oct 20, 2011 Begginging and ending of childhood Oct 20, 2003 When I was 5 years old I shot my first gun. Apr 20, 2005 2. When I was 7 years old I broke my arm jumping on a trampoline Oct 20, 2007 Ovulation in females, and sperm production in males begin. Period: Oct 20, 2007 to Oct 20, 2013 Begginging and ending of puberty Sep 15, 2009 3. When I was 11 years old I ripped my leg open playing Basketball. Period: Oct 20, 2011 to Oct 20, 2018 Begginging and ending of Adolescence Period: Oct 20, 2018 to Oct 20, 2078 Beggining until death of adulthood Oct 20, 2028 Skin starts to become wrinkled. Oct 20, 2028 Aging begins. Oct 20, 2048 Aging becomes more noticeable and progresses rapidly.