15th week - Lower limbs are well developed and toenails start to form. 16th week - All 20 teeth buds are in place. Mother feels movement. Reacts to outside noise and vibrations. 22nd week - The baby can hear and recognize mother's voice.
Sex organs are visible.
Baby can open its eyes. 24th week - Sweat glands are developed. The skin changes from transparent to opaque. 26th week - The baby is now covered in a fine down hair. He practices breathing by inhaling amniotic fluid.