how big is a 17 week fetus

A 17-week fetus is about 11 to 14 cm (approximately 5.1 inches) long from crown to rump and weighs around 100 to 150 grams (about 4.9 to 5.3 ounces). The size is roughly comparable to an orange or a pomegranate. The fetus is growing quickly, with longer legs and more baby fat starting to develop to help regulate body temperature.