Wanted to ask, is it beneficial/recommended in islam to stop breastfeeding at 21 months for boys, and is it that the milk is not beneficial for the children between 21 and 24 months and that Ayatullah seestani mentions to stop breastfeeding at 21 months? My son is 21.5 months old and he is very attached and dependant on breastfeeding. I am confused about this matter. Need clarifications.

Please kindly wean your son of from your milk. There is wisdom in the Quranic message with reference to time period on breastfeeding milk