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?

Cake icing usually contain a high concentration of sugar! As an adult, I still get a "high" eating cakes with heavy frosting. I can only imagine what it must feel like for a 7 month old baby. I wouldn't say it's bad in such a small quantity but it will make baby hyper especially if it's baby's first time tasting something sooo sweet. It will wear off eventually and probably fall asleep.