As any parent will tell you, especially a first-time one, it's very easy to become overbearing and overly worried about an infant's health in their first few months on this planet. My son's a toddler and I still find myself constantly checking his vital signs to make sure that they're normal.
But those first couple of weeks, you're a madman Googling any and every type of illness that could befall your child. I preemptively knew how to spot an infant's flu or whether they showed signs of RSV. My wife and I would wake up in the middle of the night to check his breathing, because of the SIDS horror stories we'd heard.