ديغا نيكايا 1:556
SUJATOPuna caparaṁ, ānanda, yadā bodhisatto sato sampajāno mātukucchismā nikkhamati, tadāyaṁ pathavī kampati saṅkampati sampakampati sampavedhati.
Furthermore, when the being intent on awakening comes out of his mother’s belly mindful and aware, the earth shakes and rocks and trembles.