At 17 weeks pregnant, the baby is approximately 5.1 inches (about 12-13 cm) long from head to bottom and weighs around 4.9 to 5.9 ounces (140-170 grams). This size is roughly comparable to a pomegranate, a large onion, or a turnip
. The baby is developing rapidly at this stage, with body fat beginning to form, fingerprints developing, and the skeleton starting to harden from cartilage to bone. The baby is also becoming more active, moving joints and practicing reflexes such as sucking
