NB - average age 0-3M XS/S - average age 3-6M M/L - average age 6-12M ・・・ Our organic Knotted Hat is a newborn necessity. Featuring an adjustable tie knot, our hat is snug and comfy. Made of 100% organic cotton fabric Fits snuggly to keep a baby's head warm Sustainably and ethically produced with eco-friendly AZO / heavy metal free water-based dyes Naturally hypoallergenic