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.
Although it's nerve-wracking to think about, many illnesses and injuries that befall infants and kids happen from seemingly innocuous occurrences. Like who would ever think going down a slide with your baby could do something like this? Look closely at the little girl's poor foot. :(
Each stage of a child's life means that they're past certain dangers, like SIDS, or running into table corners and bumping their heads, but that also means they're open to new dangers, too.
Like when your infant is old enough to keep their head up and is too big/chunky for their baby-rocker or bassinet, it's temping to lay them down in bed with you. Especially if they're asleep and you don't want to disturb them, you figure why not get an hour of adult time or to just go to the bathroom, eat, and have a few quiet moments.