Luqmân
In the name of God, Most Gracious, Most Merciful.[31:14]
And We have enjoined on man (to be good) to his parents: in travail upon travail did his mother bear him, and in years twain was his weaning: (hear the command), "Show gratitude to Me and to thy parents: to Me is (thy final) Goal.

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* v.14 : The set of milk teeth in a human child is completed at the age of two years, which is therefore the natural extreme limit for breast-feeding. In our artificial life the duration is much less.