I'd be careful you're talking about the same thing as a US ER because there are two other places you can take your kids in an "emergency" in the US that are not called ER: you can go to the kid's pediatrician who will have emergency appointments during roughly the same hours stored are open (e.g. Saturday and Sunday); and there are Urgent Care centers that are usually open late into the evening 7 days or possibly 7*24h. Urgent Care have basic X-ray and will stitch up pretty bad gashes. I have two kids and we've only been to the ER one time when my son was in anaphylaxis. Broken arms, facial lacerations, were handled at Urgent Care.