Zara boys size 12-18 months contrasting sweater runs big 18-24 months

Zara boys size 12-18 months contrasting sweater This sweater is so soft and a lighter staple piece that can be layered with a coat or just worn with some jeans. My son wore this year round when he was 2-3 yrs old. I would say this sweater does run big and fits more like 18-24 months or so. In great condition Never been in dryer always laid flat to dry comes from a smoke free and pet free home