Alejandro's life By alejandrott Period: Feb 4, 1998 to Feb 8, 1998 zygote Period: Feb 8, 1998 to Apr 4, 1998 Embryo Period: Apr 4, 1998 to Nov 4, 1998 fetus Apr 8, 1998 heart develops right and left chambers. Jul 8, 1998 bones are visible. heartbeat can be heard with a stethoscope. Aug 8, 1998 fingerprints form. Sep 4, 1998 infant begins to crawl. Period: Nov 4, 1998 to Nov 4, 2000 infancy Period: Nov 4, 1998 to Nov 4, 2028 skin starts to becom wrinkled Dec 4, 1998 heart beats regularly. eyes and ears begin to form. Period: Nov 4, 2000 to Nov 4, 2011 childhood Period: Nov 4, 2007 to Nov 4, 2013 puberty Period: Nov 4, 2011 to Nov 4, 2018 Adolescence Period: Nov 4, 2018 to Nov 4, 2078 Adulthood Nov 4, 2028 skin starts to become wrinkled Nov 4, 2028 aging begins.