What is the meaning in the Buddha walking seven steps? When Buddha was born, he walked seven steps and then stopped without stepping the eighth step, and at every step there was a shower of rain. I ask: what does the seven steps symbolize?
According to Mahāpadā­na­sutta, when he was born he stood firm on both feet, then with his face to the north took seven strides while a white canopy was held over him. There is no mention of a shower at every step though.

According to Mahāpadā­na­sutta commentary, standing firm on both feet is a portend for achieving the four iddhipada (Intention, Effort, Consciousness, Investigation). Facing north is a sign that he'll rise above others, the seven steps he walked is a portend that he'll achieve the seven factors of enlightenment (satta bojjhaṅgā) and finally the white canopy held over his head is a symbol that he'll achieve nirvana.