Just figured out #29.
It's from the Acchariyabbhutadhamma-sutta, MN 123, where baby Gotama takes seven steps and declares,
“I am supreme in the world, I am the highest in the world, I am the first in the world; this is my last birth, there will be no further existence.".
Ven Analayo has just published "Genesis of Bodhisattva Ideal" and he compares this sutta with its Chinese parallel that is missing this episode.
The Pāli version records a declaration made by the newly born bodhisattva on this occasion, in which he proclaims his superiority in the world and his transcendence of future existences, a declaration absent from the Madhyama-āgama parallel.
Thus the mere ability of an infant to speak at birth was in itself not necessarily seen in a positive light. Besides, according to the Pāli Jātaka collection already in two previous existences the bodhisattva was able to speak right after being born.69 Since these instances are not explicitly reckoned as marvels, in the present case the marvel would be the content of his proclamation.
The Madhyama-āgama version differs from the Acchariyabbhutadhammasutta in as much as it only records the seven steps, without any proclamation made at all.70 Nakamura (1980/1999: 18) is probably right when he concludes that “the verse claimed to have been proclaimed by the Buddha at his birth was composed very late.”71....
When considered from the perspective of the didactic function of the Acchariyabbhutadhamma-sutta, the proclamation made by the bodhisattva Gautama may at first have come into being as just another facet in the overall scheme of exalting the Buddha. Yet, this particular marvel has consequences that originally may have been neither intended nor foreseen.
The significance of this proclamation emerges once it is compared with the passages examined in the first part of the present chapter. These passages invariably indicate that the bodhisattva was not yet awakened, anabhisambuddho,
which holds true even in the case of those versions that do not employ the term bodhisattva. Thus, from the perspective of this general consensus among early Buddhist discourses, the bodhisattva would have been able to make the claim that “this is my last birth, there will be no further existence” only once he had become a Buddha. .....
On considering these formulations, it seems safe to conclude that when these descriptions of the Buddha’s awakening came into being, the idea had not yet arisen that already at his birth he knew that this was going to be his last birth. In other words, the proclamation made by the infant bodhisattva in the Acchariyabbhutadhamma-sutta involves a clear shift of a claim, originally made after awakening, to the time when the bodhisattva Gautama had just been born.77