Clinically, it's defined as excessive, unexplained crying in a healthy infant for more than three hours a day. The evidence points to a multifactorial gut-brain axis thing, maybe immature motility or microbiome. But honestly, in my clinic, I see it spike when the air is thick with parental anxiety—it's a feedback loop. My father's hands never shook repairing a radio, but new parents, drained from work commutes and bills, transmit a tension a baby can't digest. We treat the family, not just the gut.
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