New maids mean the fresh maids that are coming to Singapore from the neighboring countries like Philippines or Indonesia in search of work. Most of them are working for the first time and they do not carry much experience.
A reputed maid agency tries not to employ new maids as they cannot afford complaints from the clients. These maids are working with small agencies to get experience. So instead of going for a new maid, it is better to have good transfer maids. The transfer maids can be called the experienced maids as they have been working in Singapore for a long time with different employers.