These adorable rompers are a perfect boutique style and they have easy access with a snap bottom! Cotton Blend called Butter Cotton....very soft & washes well *measurements* 0 6months:20" length & 7.5" chest, 6 12months:22" length & 8.5" chest, 12 18months:23" length & 9" chest *measurements* 0 6months:20" length & 7.5" chest, 6 12months:22" length & 8.5" chest, 12 18months:23" length & 9" chest