The biggest concern for newborn babies when using cloth diapers is fit and protecting their umbilical cord stump. Because you won’t know the size of baby until she/he is born, it is hard to know which diaper will be a good fit. So if you want to be prepared, you can purchase newborn-sized diapers which will be trimmer and have a drop down in the front so it won’t rub against their stump. There are a number of one-sized diapers that claim to have a weight range starting at 4lbs. So be sure to check the specifications of each diaper to see if a one-size might be work for your newborn.