No, this is generally a terrible idea. Young children’s ears are sensitive and subjecting them to loud music without serious ear protection is bad for them, not to mention the other things that might not be good for a baby, such as BEING DROPPED IN THE MOSH PIT*. We reserve the right to refuse service to infants and even most toddlers. And if they put up a fight, we have a distinct size advantage.
(*note: we also frown on mosh pits)