Color: Blue Denim Size: 3-6 months (60) Square neck, button closure at the back Short sleeves, eyelet and scalloped detail at the hem Stitch detail at the waist Elastic leg openings Snap buttons at the crotch for easy changing and diaper changes It seems like it can be worn in spring, summer, and autumn depending on the inner layer. Worn only once for about an hour, and the baby didn't drink milk or sweat visibly. It's denim, but I think it's a soft material. Sold out online last year, and I think the same item was in stores this year as well.