LACE VARIES!!!! Sizes 4T & under and sizes 5T & up have different laces!!!! In general reviews say they run true to size (a few have said on the generous end and more so in baby/smaller sizes). If in between sizes the smaller of the 2 would most likely work (unless you want lots of room to grow/extra length). Some customers size down so it's more fitted/better fit or vintage length and others like to have room to grow or to wear 2 years.