I'd search photographers in my area, then compare prices and spend accordingly to what I could afford.
Our photographer offered several packages we got a maternity/newborn bundle package for $165. That included 1 1/2 hr maternity session, 2 hr newborn session, and a disc along with a copyright release to the images.
My friend referred me to a place and on her website it sai that. 2 he newborn session is $175 but it doesn't say what all it includes so I sent an email to get some info but I want sure if that was high/low/normal but I definitely want to search around and see but tonight was the first time I had given it any thought