In the second trimester, your baby’s organs mature and its skeleton starts to harden. The baby swallows amniotic fluid and passes it out through its gut. The kidneys start to work and pass small amounts of urine.
By 19 weeks your baby is able to hear, and is covered in fine hair called lanugo. If you have a scan at this stage, it’s often possible to find out the baby’s gender. By the end of the second trimester, your baby has a chance of surviving if born prematurely, but would need intensive care.