My LO put everything her mouth and i can't get her to stop. Sometimes, she threw her milk out, after putting stuffs into her mouth. How to stop her from doing this?

Am not sure how old is your LO. For my children, I would quickly hold their hand if they tried to stuff things into their mouth. Then I would tell them that they cannot put things into their mouth if not for eating. I got to consistently explained to them but back then, they were less than 1 yr old and talking to them, took me longer time but it was needful. My friend, on the other hand, told me she would smack her LO's hand and told her LO off fiercely.