6 weeks - Mar 09 2001 - 0.6 centimeters (0.24 inches) - between the crosses

12 weeks - Apr 10 2001 - 4.8 centimeters (1.9 inches)

20 weeks - Jun 01 2001 - 12 centimeters (4.7 inches)

30 weeks - Aug 19 2001 - The day Jill started to go into labor