Generally women are not allowed to feed her breast milk to her own child aged 2 years and above. Please explain this as per Islamic Shariah with dalails.
بسم الله الرحمن الرحيم
(Fatwa: 477/477/M=05/1435)
After the time of breastfeeding is over it is not allowed to breastfeed a child for the reason that the permission is limited with compulsion, and such a permission will continue only as long as the compulsion lasts. In short, Allah has made human being respectful and honourable with all its parts and milk is also a part of the woman and the benefit from human part is against human respect. Hence, originally it is unlawful, but since the child depends on it hence the Shariah has made it allowable up to a specific time.
ولم يبيح الإرضاع بعد مدته لأنه جزء آدمى والانتفاع به بغير ضرورة حرام على الصحيح (شامى)
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband