Originally posted by randesigns I have those, haha! Pentax K-r with the 18-55mm lens. 16GB card as well. I was part of a wedding and noticed the photographer had reflectors so that's the kind of thing I was thinking of.
Well, there's such a huge spectrum of what you might "need", that it's a pretty vague question. It's largely dependent on so many things like, what kind of shots you're trying to take, what you location is like, what time it is, what the weather is like, how good you subject looks what your style is. You can take amazing shot with just what I mentioned, or you can take amazing shots with $10,000 of lighting equipment. It all depends on who's shooting, what they're shooting and when they're shooting it.
Like most have said, reflectors are a good place to start. But keep in mind that you'll likely need something or someone to hold them. Also, try to get on of the 5-in-1 kind, that have multiple surfaces, plus a translucent center that you can use to diffuse whatever your light source is.
The biggest thing you need is an idea of what you're going to do. There's nothing worse, especially as a beginner, than being on a shoot, desperately scratching your head for ideas. Look up maternity portraits on google or flickr and get some ideas so you're not going in cold.