Abstract: The invention relates to a romper suit for crawling babies, characterised in that it is made by using two types of fabric, namely: an inner fabric made from 100% cotton or a cotton and polyester mixture, which protects the baby's skin or clothing; and an outer mesh-type fabric made from 100% polyester or 100% nylon. The romper suit is provided with: a bies tape around the neck and armholes, which is made of the inner fabric; an elastic material sewn between the first and second fabrics at the waist, ankles and cuffs; protectors at the knees and the soles of the feet, comprising an inner padded layer and an outer ant-slip layer; and closing snaps or buttons on the upper part of the shoulder. The romper suit can be made with or without sleeves.