I have used our normal detergent since before she was born.... She had eczema when she was little and even changing over detergents didn't make a difference for her ( not sever eczema though). When washing her littlie stuff before she was born I used hardly any detergent really, and as she got older all her stuff now gets thrown in with ours.
Good luck with it hun! OMG just looked at your ticker - whoa baby!! That has gone SOOOO fast, how exciting! Can't wait!