This is true, in that many pediatric only ERs attached to academic centers, they will hire residents right out of training. However, there are caveats to this. Typically, these positions function as urgent care or fast track positions, ie you will get the runny nose, strep throat, fever, etc. Obviously, sometimes things can be mis-triaged or if you are in a separate urgent care area, a parent may bring a sicker than expected child in, but at that point, you need to get the kid somewhere else to manage the severity illness as the urgent care areas aren't staffed or equipped to take care of sick kids. Long story short, you can be part of the ER division/department, but you won't be tasked with seeing very sick kids. Likewise, less sick kids typically are billed less, thus a lower salary (I don't know numbers though).
In a private or rural setting, you may be called to go to the ER to take care of kids in an ER staffed primarily by adult physicians given your pediatric expertise. I can't really speak to this specifically because I've never worked in a setting like that, but I can't tell you in one of the satellite, more community hospitals in our hospital network, when there is no pediatric EM physician available, the pediatric hospitalist (ie did only residency typically) staffs the ER. There, they staff all pediatric ER visits, from asthma to cardiac arrests. When the presentations are bread and butter urgent care stuff, it's not a big deal. But when someone presents really sick and you don't practice a specific thing frequently or routine (ie respiratory or cardiac arrest), the outcomes tend to not be as good (ie, I wouldn't take my kids there at certain hours). Again, long story short, yes in more community or smaller private hospitals, you may be able to find a ER gig for the pediatric patients. The pay may be better (better than academic position with pediatric EM fellowship training) depending on the location, type of hospital, need, etc. However, I still think the typically position for people right out of residency is the urgent care/fast track position, simply because you won't have the skill set to take care of really sick pediatric patients independently.
You can get a favor of openings here:
http://jama.careers.adicio.com/jobs/pediatric-emergency-medicine-26323918-b
As you will see, a lot of positions require BE/BC Pediatric EM training, but this is likely not an exhaustive list.
