Development Timeline Birth - 18 By andyg823 Period: Dec 27, 1991 to Aug 23, 1992 Pregnancy May 30, 1992 Healthy meternal age My mother was 30 when I was born this is a healthy age for the conception of a child Jun 30, 1992 Drug and alchohol free pregnancy This is a huge factor in prenatal development Aug 23, 1992 Andrew Gallens Brith Period: Sep 23, 1992 to Aug 23, 1994 Sensorimotor Stage Aug 23, 1993 Learn to walk Sep 30, 1993 Speaks first word Period: Aug 23, 1994 to Aug 23, 1999 Preoperational Stage Jan 30, 1995 Coversation develops Sep 30, 1995 Start Preschool Sep 30, 1995 Developing motor skills Sep 30, 1996 Inner speech develops Sep 1, 1998 Start Elementry School Period: Aug 23, 1999 to Aug 23, 2003 Concrete Operational Stage Sep 30, 2000 Develop sense of pride Sep 30, 2001 Develop confidence Period: Aug 23, 2003 to Aug 23, 2010 Formal Operational Stage Sep 30, 2003 Starting Puberty Sep 30, 2004 Advanced thinking and reasoning developed Sep 30, 2005 Growth spurts Sep 30, 2005 Aggression and rebellion begin Sep 30, 2006 Takes more risks Sep 30, 2007 Intrest in sex begins Jun 30, 2008 Find sense of self Sep 30, 2009 Facial hair