From labour to birthOnline version From labour to birth. Classifies in any of the three stages. by Miguel Angel Preciado Lopez 1 Stage 1 2 Stage 2 3 Stage 3 The muscles of the uterus contract to open the cervix. The baby moves down to the cervix. The liquid from the amniotic sac is released. The contractions puts the baby into the vagina. A vaginal or caesarean birth takes place. The baby pass from the cervix to the vagina. The umbilical cord is cut. Contractions push the placenta out of the body. The placenta separates from the uterine wall.