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For the first part, about reincarnating as a maid and drinking the poison for the nobleman which made her a child again, I think the manga's called Saving the Villain Who Was Abandoned by The Female Lead!
idk if you are still looking for this manga but it is called
I think you might be referring to "Saving the Villain Who was Abandoned by the Female Lead"
"Does anyone know the manga where the fl is reborn as a made to a nobleman and knows he's going to die so drinks the poison for him and ends up becoming a small child? She's then adopted into another noble family with 2 brother and a dad that are all scary and make her drink poison as a test."
I think the webtoon you're thinking of is this one!
Saving the Villain From the Heroine