Melania and Barron had been living in the Trump Tower New York City penthouse, with the given reason of not disrupting Barron's school life by moving before the end of his school year.
He'll now be attending a private school in Maryland.
Melania has been perceived as apparently reluctant to embrace her duties as First Lady.
She accompanied her husband on his first official overseas tour only a few weeks ago, joining her husband on a visit to Saudi Arabia and Europe.
But she has been slow in hiring staff and finding worthy campaigns to fight for, instead directing media focus more towards her fashions and interactions with Donald.