There isn't anything I could find in the Bible about BFing - it's just assumed it is done and women seem to have lighter responsibilities whilst BFing, but there are very few mentions of anything like that.
The Old Testament finishes about 2500 years ago - before the writings Yael mentioned - and the New Testament is not so much about laws. I'll check more tonight, but nothing really springs to mind - the only thing I could think of was in Samuel, where Hannah was going to wean her son before dedicating him to the Lord, but no mention of how long that took.
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