Although the shirts are sized a bit big for 0-3 mos, the neck openings are easy to get a newborn head through.  They came in handy for our newborn, because they were long enough to mostly cover her and had easy access for frequent diaper changes.  But beware, they do stretch significantly and immediately.  They are also lightweight, so they might not be too useful in the winter.  Overall, I'd buy them again.