I used Thirsties XS Covers. They were excellent - kept in everything and fit very well over prefolds and fitteds. I also liked that they didn't make her bulky...plus they were cheap.
I have a Thirsties XS cover and a wool soaker. I'm not gonna buy any more because I make big babies (DS was 9lbs 15oz and only 1 day late, we are expecting this one to be around 10 lbs 2-3oz) So I don't expect to be using newborn size very much, which is why I didn't make very many NB diapers. I have some OS fitteds that should fit fairly well especially after the first week.
Re: NB Cover ?
Tyler is going to be a big brother!