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 27 of 36 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 27 Week 31: a Serving Tray Your baby is measuring 16.18 inches now, approximately the size of a serving tray. (Side note: how good do those donuts look?) Previous Next Start Slideshow Pregnancy