Iacisrama
I’m not sure why there is a question.
There is no question kitniyos is muttar behanah
you can give it to a sefardi
Most allow it for infnats (most baby formula is kitniyos)
Food on Yom Kippur isnt muktzah (See Remah 612:11) So kitniyos on Pesach is more chamur than food on Y”K???
(chametz is muktzah on PEsach but not comparable as since it is assur behanaa it has no use)