If you are looking for a wool cover that fits perfectly on a newborn and on a baby up to 2-3 months old, the newborn size will be the best choice. PUPPI Newborn wool covers fit babies up to about 6.5 kg and provide a perfect fit and no big bottom effect. Well thought cut allows proper airflow in the diaper, and ensures that our wool cover will fit on any absorbent insert and PUPPI fitted diaper in Newborn size. Wool cover is an outer part of a cloth diaper which is supposed to keep the moisture of absorbent insert inside the diaper. When it's time to change the baby's nappy - we change the absorbent insert inside the diaper (or the fitted diaper), and we hang the wool cover for airing. It will be ready to use at the next diaper change. Care Instructions: Hand washing using wool shampoo. Ventilate after each use. Detailed information about washing you will find in the leaflet joined to your cover.