Mom, I apologize if it's very long and messy, but has anyone ever deal…

Mom, I apologize if it's very long and messy, but has anyone ever dealt with lactose intolerance in newborns? Are there 100% symptoms that it is this? Or is it just normal gas or colic? We've been at it for two weeks now, but in the tummy, there's constant chaos - something rumbles, burps, pops up constantly, and it's really loud. When I massage his feet, they pop right up. It feels like there's always bloating. But he sleeps well, in a half-sleep, he tries to pop and then goes back to sleep. He doesn't cry much, he gets upset sometimes. We're exclusively breastfeeding, the baby