I would second Horseshoes. I've shot a German Luger and a shotgun. The recoil on both was a b*tch, but a huge difference in sound. The luger was not bad at all. Depends very much on the gun, but you'll be hearing "echoes" for a while. I grew up in gun country. Of course, now I hate guns, but I'm glad I know how to load and fire one. I would tend to say that foreign guns are quieter than the American counterparts, more compact too.
Children's ears recover much quicker than adults. Each of my kids had allergy issues and we had an ear specialist practically on retainer. I would venture to say that the child's hearing will recover considerably faster than the adult's.
And, as was already said, a woman would have a difficult time holding a squirming eight year-old (about 60 lbs) in one arm, but a buff guy would have no problems at all. I carried my son when he was 6 years old (about 50 lbs) and I was pregnant, but I wasn't holding him with one arm out front.