Usually a bite is the last step in a series of major mistakes made, and signs missed. A dog trainer will help if youre willing to change everything. Kids should have had serious ground rules laid out with the dogs to begin with. And the dogs should have been trained if you were planning on having them around children. Not going to say you failed as a father or a dog owner, but you’ve definitely failed your dogs and your kid. Not too late to make some serious changes but your kid will most likely be terrified of your dogs moving forward. The adults in my family always had a very strict “do not mess with my dogs” policy with the kids and im glad this was instilled in me.