for the first week: infusorians, egg yolk, banana/microworms, vinegar eels.
for the remainder of the first 1-1.5 months: banana/microworms, vinegar eels, baby brine shrimp (freshly hatched)
starting at 1-1.5 months: frozen daphnia, repashy meat pie, golden pearls
1.5-2.5 monthes: golden pearls, frozen daphnia, frozen brine shrimp, frozen bloodworms (at first cut up, then whole), frozen mysis (at first cut up then whole) atisons betta pro
2.5 months and beyone: whatever it will eat. it is now a sexually mature (or almost mature) subadult. it should not only accept pellets and frozen food with enthusiasm but beg for them like any adult betta.