These are nice shirts but there's something way off on the sizing. I bought an XS for my four-year-old son, who wears 4T and 5T shirts. XS was listed here as for sizes 4-5. The shirt I received was an XS and it was almost comically small. I'd probably try a medium for something that would fit my son. Fortunately, we also have a two-year-old daughter and the shirt fit her well -- with not much room to grow. So it worked out for us in the end, but only because we have a much younger, much smaller child.