What is the waiting period (iddah) for a breastfeeding woman whose menstruation has ceased due to breastfeeding, why does her waiting period not begin immediately upon her divorce, and what is the wisdom behind that?

The 'iddah (waiting period) for a breastfeeding woman who experiences menstruation is three menstrual cycles (hayd), as Allah Almighty says: ﴿And divorced women shall wait by themselves for three periods﴾. And 'quru'' refers to menstruation. It is obligatory for a Muslim, once a Sharia ruling has been established for him, to submit, obey, and believe that it contains complete welfare and profound wisdom.