You really only need scrap fabric to make this dress. I had some leftover fabric from the dresses I made for C and myself. I could've easily made another 9 dresses out of the fabric. That's how little you need for an infant size.
She'd decided to wear her own dress made from the same cut of the fabric (literally) that day. I decided to deliver a suicidal question "Would you like to have a baby sister?" and I got a strong "No!" as feedback. What a relief. I'm not sure if I'm ready to do it all over again... :-)