Other developmental milestones in the second trimester.
• The body is covered with lanugo - vellus hairs, which are involved in heat regulation and protect the skin along with vernix lubrication.
• The lungs produce surfactant, a substance that will help the alveoli open after birth so that the baby can take its first breath.
• The rudiments of milk and permanent teeth are formed.
• The baby has individual facial features, eyebrows and eyelashes, and facial expressions are developed.
• The baby sucks his fingers and plays with the umbilical cord.
• By the end of the trimester, the child hears and distinguishes tastes.