Young mango plant.

[Gentman]

This 3 months old grafted mango tree is bearing flowers? Can someone explain.

[chrobrego]

It's grafted so the graft isn't aware that it's a very small plant. It will sometimes flower and try to push a fruit. Don't let it fruit at this size or you can risk killing your tree.  Remove all fruit for the first 3 years (maybe two) to allow the tree to build up a strong trunk and deep roots.