I ordered the first pair of Paw Patrol light up sneakers for toddler boy aged 3 for his birthday in a size 8. (dk. blue with red accents) His mother had advised he wore a size 7. I ordered up one size to be on the safe side. Shoes came quickly, nicely packaged and are well made. Flashing lights work well with every step. My grandson is very thin build, with slender, narrow feet, and was thrilled with his birthday present and extremely excited to put on and wear his new Paw Patrol Light Up Sneakers. So glad I ordered up 1 size over his regular shoe size. Even so, the shoes were difficult to get on his feet, and very tight. 2 months later, he received a second pair of the same shoes for Christmas in a size 10. Perfect fit. The size 8's shoes were passed down to his younger brother. (Not quite 2 years old with a wider foot.) Adequate longer Velcro strap ensures a perfect fit across the width and top of the shoe for the wider footbed of the almost 2-year-old with fat little, wide feet, or just Velcro the strap tighter for little boys with narrow feet. You could easily size up 3 sizes from usual size for longer wear and just tighten the Velcro strap. Size up at least 2 sizes from normal size for comfortable perfect fit. I know the little boy in your life will love his Chase and Marshall Light Up shoes as much as the little boys in my life do.