I'm not a parent yet, but I don't think monitors at a very early age are contributing to helicopter parenting. An infant has all sorts of risks that could cause very sudden death that I'm sure most parents want to avoid. Being able to leave your baby in another room without anxiety over those things probably helps a parent develop a healthier "concern, but don't need to be ever watchful" attitude.
My counter example is my sister in law who is very helicopter of her first child, even now that he is over a year old. They've been in small apartments, and have traveled a lot with him in arms(no car, so no car seat). I doubt they have ever used a monitor. I bet if she had had more opportunities to put him in another room to sleep without concern, she'd be more willing to let family play with him in other rooms of my parents' house during holidays.
My counter example is my sister in law who is very helicopter of her first child, even now that he is over a year old. They've been in small apartments, and have traveled a lot with him in arms(no car, so no car seat). I doubt they have ever used a monitor. I bet if she had had more opportunities to put him in another room to sleep without concern, she'd be more willing to let family play with him in other rooms of my parents' house during holidays.