Well to start off I purchased 3 toddler shirts. I have triplet boys who are 2 years old will be 3 in June. The identical two wear a 3t and it was a perfect fit to them. Now the third one is a big boy he wears a 4t and it was a perfect but he will our grow it really soon. This company has not disappointed, I ordered the shirts and a pair of shorts and literally 3 days later it was at my door step. I love what you guys are doing and the quality of the clothing.