Cute nursery. And good luck to you and baby. It's a happy time and it brings back warm memories for me.
I wouldn't worry about bringing your child to WDW as a baby. My only thought is about the time of year. My DD was born in Miami in July. We went to the MetroZoo a month later, and she was broiling in her stroller. There's not a lot of netting to let a breeze run thru it. And it was difficult to keep the sun out, as we changed directions so much. Orlando can get as hot, if not hotter, than Miami in the summer months.