Our Mid Bikes category is our most common selection of bikes and fits a majority of children from 3-5 years of age. I still suggest measuring your child's inseam to make sure the child will fit these bikes. If you have a child that is 4-5 years of age and tall for their age, you may want to check out the bikes in our "Big Bikes" category as their inseam may be 17" and beyond. This is only to be used as a guide and in all cases you should use our sizing guide to see which bikes will fit for sure