A pediatrician is a doctor who specializes in the regular care of children, as well as the diagnosis and treatment of illness in children. Young patients are often more complicated to treat because they are still growing and developing.
While pediatricians may sub-specialize in specific therapy areas like oncology, surgery, ophthalmology, and anesthesiology, in general, pediatricians provide services like vaccinations, health exams, and treatment of common ailments and injuries. In addition, pediatricians are trained to handle the complex emotional and behavioral issues faced by children, especially during puberty.
Pediatricians normally see their patients from birth until the age of 18, although some may agree to treat patients into their early 20s, if requested.

An emergency physician is a doctor who is an expert in handling conditions of an urgent and extremely dangerous nature. These specialists work in the emergency room (ER) departments of hospitals where they oversee cases involving cardiac distress, trauma, fractures, lacerations and other acute conditions.
Emergency physicians are specially trained to make urgent life-saving decisions to treat patients during an emergency medical crisis. These doctors diagnose and stabilize patients before they are either well enough to be discharged, or transferred to the appropriate department for long-term care.

The main responsibility of a perinatologists, also known as a maternal-fetal medicine specialist, is to treat, monitor and assist pregnant mothers through high-risk pregnancies. This includes high blood pressure, early labor and bleeding. They’re also able to identify birth defects and then recommend necessary treatments to support your baby before he/she is born.
Other reasons you may need to see a perinatologist during your pregnancy include diabetes, problems with a previous pregnancy or carrying twins. Having completed OB-GYN training, they’re experts on the female reproductive system with additional specialized training in un-routine pregnancies. So, whether you know you’re at risk going into your pregnancy or problems arise unexpectedly, perinatologists can help you.