breast milk stop?

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I have been giving breast milk to my baby for about 5 and a half month but on the sixth month my breast milk started to stop. I don't the reason why. Is it natural? Is there something I could do to bring it back? I wanted to breastfeed my baby so he would be strong and healthy. Breast milk contains a lot of nutrients and vitamins. It's a good thing because it is a natural source. Do you have any idea if there's still possibility to have it back? Please help me out. Thank you in advance!