I gave a pea-size goldilocks cake icing to my 7-m.o baby and I just noticed she went so hyper, shouting out so loud from morning til evening. Is cake icing bad for babies?

Hmm.. I don't think a pea-sized icing would trigger a baby to be so hyper. It could be a coincidence. I would understand if she ate quite a large amount of cake or icing. :)