22 weeks

Boo now weighs almost 430 grams, measures just over 27 centimetres long from crown to heel, and is proportioned like a newborn, albeit a thinner version since his baby fat hasn't yet developed. Although he's getting heavier every day, his skin still appears wrinkled because he needs to gain more weight. The lips are distinct and the eyes are formed, though the iris (the coloured part of the eye) still lacks pigment. The pancreas, essential in the production of hormones, is developing steadily. Even this early, the first signs of teeth appear in the form of tooth buds beneath the gum line. Before we know it, our baby will be born, and soon after, his first teeth will come through.