Gray romper with polo collar and two front pockets - Brand: JANIE AND JACK - Color: Gray - Condition: Worn once and washed - Design: Polo collar - Pockets: Two front pockets - Material: Knit-like cotton, poly, and spandex - Buttons: Buttons on the back and crotch - Size: US 6-12 months, which is about 70-75 in Japanese sizes (according to Mercari's size chart). It seems like it might be a bit snug if your child usually wears size 80. My son wore this for half a day on his 1st birthday. He was 9.8 kg at the time, and it fit perfectly! Please feel free to ask if you have any questions!