Historical clue formulations

• Nascent stage — 2019-05-17
• Beginning stage — 2017-12-12
• Occupant of a 52-Across — 2016-07-17
• Baby baby? — 2011-07-03
• Womb occupant — 2008-11-24
• Developing stage — 2001-04-01
• Early stage — 1999-08-08
• It's in development — 1999-07-06
• Life, in the early days — 1997-06-25
• First stage — 1996-05-14
• Future fetus — 1995-04-12