Week 13 - Nov. 13 - 19 + Second Trimester Week 14 - Nov. 20 - 26 + Week 15 - Nov. 27 - 3 + Week 16 - Dec. 4 - 10 + Week 17 - Dec. 11 - 17 + Week 18 - Dec. 18 - 24 +* Week 19 - Dec. 25 - 31 + Week 20 - Jan. 1 - 7 +* Week 21 - Jan. 8 - 14 Week 22 - Jan. 15 - 21 *+ Week 23 - Jan. 22 - 28 + Week 24 - Jan. 29 - 4 +* Week 25 - Feb. 5 - 11 + Week 26 - Feb. 12 - 18 +* Belly Comparison chart