Under Armourboys Baseball Pant, Belt Loops, Logo, Snap Closure, Comfortable & Durable Baseball Pant

How are you supposed to know what size medium is? Every pair of pants ive gotten for my kids where small medium and large, this is numbers

Do these go to the knee or all the way to the ankle?

Size 4 was just listed at $13.21 and now when I came back to the site it says $17.63?

My son is in 4t pants will the little boys size 4 fit him?