Very nice booties. I've tried using yarn (and gauge) not called for in bootie patterns and gottem huge things. I made one and didn't make another one like it. Tried another pattern and made another huge bootie. A while back my DD was here with DGD and she was old enough to be walking. Mom took her boots off to be in the house and I thought she needed something on her feet. "Wait a minute, I have just the thing." I sewed up the seam in one of the booties that had never really been completed and had two huge booties that made nice mismatched house slippers for visiting granny. LOL
I don't know it yours are that big. They will fit sometime. Some babies feet stay small for so long. Your yarn is yummy looking, so nice and soft looking. I have a hard time making a sweater and booties that will fit at the same time.