Hello there!
I found your message, oddly enough, looking for Metal Mums :) \m/
While my LO Isabella has changed many things, she has not changed what I listen to or how I dress- At the cost of me feeling like the odd one out in some mumsy situations ;)
Izzy went to a number of gigs while inside mummy's tummy, and my husband maintains that the best way to put her to sleep is anything by Devin Townsend (other bands work just as well, she has just fallen asleep to Iron Maiden).
As you mention child friendly metal festivals, I went to Tuska festival last summer, while I was around 22 weeks pregnant and feeling absolutely massive. I was very pleasantly surprised by the amount of families who made it a family day out- The first shop as you went into the festival compound was a shop of ear defenders with not one but three models for babies! Furthermore, it was easily reached by the Helsinki metro system (no camping, which is impossible with young kids)
While the concrete floor wasn't the most comfortable to sit on for the grownups, you would not be lugging a pushchair through a muddy field. Also, Finns are very strict with alcohol policies, so there was absolutely no drinking outside the beer tents, and zero tolerance policy regarding antisocial behaviour. Very civilized, plus we made it into a holiday and visited Talinn and Helsinki as well.
Now, this year's Tuska does not look like a line-up we'd be tempted by, so I'm not really sure where to go- And while Wacken looks good, I have no idea how practicable it would be with a 7-8 month old baby- Any clues?