will's lifetime By 9218366 Period: Jun 8, 1998 to Jun 12, 1998 Zygote Period: Jun 16, 1998 to Aug 16, 1998 Embryo Jul 8, 1998 Heart beats regularly. Eyes and ears begin to form. Aug 8, 1998 heart develops righ and left chambers Nov 8, 1998 bones are visible. heartbeat can be heard with a stethoscope Dec 8, 1998 fingerprints form Jan 8, 1999 Eyelids can open and weight can be up to 6.6 pounds. Period: Mar 8, 1999 to Mar 8, 2001 Infancy Jun 8, 1999 Fetus Jun 8, 1999 A baby can hold its head up and reach for objects. Oct 8, 1999 Infant begins to crawl. kakisky. "warmfuzzy.jpg." Online Image. morguefile. No date. 2/17/12 http://morguefile.com/archive/display/181930. Period: Mar 8, 2001 to Mar 8, 2012 Childhood Mar 8, 2008 Ovulation in females, and sperm production in males begin. Period: Mar 8, 2008 to Mar 8, 2014 puberty Period: Mar 15, 2012 to Mar 8, 2019 adolescence Period: Mar 8, 2019 to Mar 8, 2079 adulthood Mar 8, 2029 skin starts to become wrinkled Mar 8, 2029 aging begins Mar 8, 2049 aging becomes more noticeable and progresses rapidly