Is expiation obligatory on me for breastfeeding my child for more than two years?

Question:
May Allah reward you and may He reward you with good. In her second question, she says: A lady says, "I am a lady with children, two boys and a girl. I breastfed the girl for three years because she was ill. As for the first boy, I breastfed him for a month and a half, which is an excess of the two years. As for the second boy, I breastfed him for three years. The question is: Is there a sin on me for that? Knowing that I knew that breastfeeding is two years. And what is obligatory for me to do as expiation if there is an expiation on me? May Allah reward you with good."

Answer:
There is no expiation on you for this, and it is permissible to breastfeed the newborn for more than two years if he needs it, if he does not do without food, then he is breastfed until he does without food.