Your baby's eyes are now open, and except for the lungs, all other organs are largely developed and functioning. Inside the lungs air sacs are forming in every increasing numbers, as are the blood vessels that will help absorb oxygen and exhale carbon dioxide. Muscles are beginning to move in a breathing motion to ensure they will have achieved adequate practice in preparation for respiration at birth.
The sex of your baby is now clear, as the genitals are completely differentiated, and the sex can be quite clearly established by ultrasound scan.
Sound frequencies, beyond those you hear can be heard by your baby, and their body may move in rhythm with your speech. Some mothers have reported having to leave concerts because their unborn babies would not keep still due to the stimulation of the music. It is not unusual for children to recognise a tune that was played frequently during pregnancy, and although familiar, they will not be able to remember its origin.
Babies that are spoken too by a parent while in the uterus will recognise the voice. While in the clamour of a noisy delivery room, babies will often stop crying and settle down upon hearing the familiar sound of their mother or fathers voice.
