My son is 3 years old he has always had trouble running , he's always falling, but recently i notice hes walks with he's left foot inward n tilted.

Probably normal-: Toeing in can come from 3 possible sources: a hooked foot, a twist in the bone between the knee and ankle, or a tendency for the entire leg to rotate inwards at the hip joint. The latter two of these usually need no treatment. A hooked or curved foot may need corrective shoes. See your pediatrician or an orthopedist. Most 3 year olds fall a lot, so it may not be related to the in-toeing.

My son is 3 years: He might have tight ligaments in his hip joints or increase in internal rotation of thigh/ leg bones/foot. Take him to a podiatrist who specializes in children. Good physical therapy and special devices that he can wear at night or serial casting can definitely help for kids under 3 Y.O. He is at the age when conservative tx heips, if someone tells you that he will outgrow this, they are wrong.