Size Chart: Size 70: Length 52cm/20.47", Bust*2: 29cm/11.42" Age 0-6 Months Size 80: Length 56cm/22.1", Bust*2: 30cm/11.81" Age 6-12 Months Size 90: Length 60cm/23.62", Bust*2: 31cm/12.2" Age 12-18 Months Size100: Length 64cm/25.2", Bust*2: 32cm/12.6" Age 18-24 Months Questions & Answers: 1. Are these Unisex? yes! i got it for my little girl and she looks adorable in it! 2. Was it run large? Size: 0-6 Months: my baby is shy of 4 months n he still has room to grow in to it!! Size: 6-12 Months: My son is 7 months but wears 9-12 month clothing. He's a beast. I got him this garment in size 80 and it fits perfect with a little room for growth. Hope that helps. Size: 6-12 Months: My baby Js 6 months 16 lbs 4 oz, 27 in long. It fit him just a TAD too big, but I suspect he'll fit it perfectly next month. Size: 18-24 Months:My son is 1 years 8 months I should have gotten the 18-24. Fit him just perfect for two wears. 3. How can i wash? I washed in cold water and hung to dry. I highly recommend not putting this item in the dryer.