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 26 of 36 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 26 Week 30: a Box of Cereal 15.71 inches is about the size of your baby and a box of cereal, a potential pregnancy craving. Previous Next Start Slideshow Pregnancy