uses several criteria for determining the time of ovulation: changes in cervical mucus, changes in the position and softness of the cervix and the dilation of its opening, and a shift in temperature
uses several criteria for determining the time of ovulation: changes in cervical mucus, changes in the position and softness of the cervix and the dilation of its opening, and a shift in temperature
affects the hormonal balance of the mother and seems to be intended by nature to space human births <=> breast-feeding
uses several criteria for determining the time of ovulation: changes in cervical mucus, changes in the position and softness of the cervix and the dilation of its opening, and a shift in temperature
can not be practiced effectively by many couples because of variance and irregularity in women's menstrual cycles <=> calendar rhythm method
uses several criteria for determining the time of ovulation: changes in cervical mucus, changes in the position and softness of the cervix and the dilation of its opening, and a shift in temperature
uses several criteria for determining the time of ovulation: changes in cervical mucus, changes in the position and softness of the cervix and the dilation of its opening, and a shift in temperature <=> sympto-thermal method
uses several criteria for determining the time of ovulation: changes in cervical mucus, changes in the position and softness of the cervix and the dilation of its opening, and a shift in temperature
uses only the appearance of mucus at the vulva, determined by the woman herself on the basis of a sensation of wetness and the color and elasticity of the secretion, to ascertain the time of ovulation <=> ovulation or Billings method