Congratulations! Your baby is full-term! This means that if your baby arrives now, his lungs should be fully mature and ready to adjust to life outside the womb, even though your due date is still three weeks away. He weighs a little over 6 pounds and measures between 19 and 20 inches. Many babies have a full head of hair at birth, with locks from 1/2 inch to 1 1/2 inches long.