Popsugar Parenting Pregnancy How Big Is My Baby? A Week-by-Week Fetus-Size Guide Based on Objects You Actually Know 8 June 2018 by Annie Gabillet View On One Page Photo 35 of 36 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 35 Week 39: a Microwave You're about to meet your baby, but it still has some cooking to do. This week, it's about 19.96 inches long, or the length of a microwave. Previous Next Start Slideshow Pregnancy