Mississippi Code Title 41. Public Health § 41-19-205

(a) His parents or guardian or person in loco parentis has resided in the state not less than one (1) year prior to the date of admission; and

(b) He is at least five (5) years of age and has such an intellectual disability that he is incapable of managing himself or his affairs, or he has an intellectual disability to the extent that special care, training and education provided at the center will enable him to better function in society; or

(c) He is committed to the center by the chancery court in the manner hereinafter provided; or

(d) He is under five (5) years of age and is approved for admission by the board of mental health, upon the recommendation of the director, because of having an exceptional handicap.