Buddy chewed through our tree when he was 10mos old. My tree is
pre lit and he chewed a six inch piece off lights and all. Thank god I found
him before he bit into a glass bulb. The tree was on and he was not shocked.
I put a gate up across the hall so he can not go into the other rooms while I sleep, however, he never leaves my side until I am up.
The bottom row of lights remain out on our tree

I am glad your
baby was not hurt.
Carol & Buddy