Suckling makes haram as birth makes haram.
The Messenger of Allah, may Allah bless him and grant him peace, came and I asked him about it. When the Messenger of Allah, may Allah bless him and grant him peace, came, I told him about what I had done, and he ordered me to give him permission to enter. The husband is the same. There is no kinship by suckling over the age of two years. I could not go in to see A'isha because Umm Kulthum did not finish for me the ten times.