Yes, after completing a pg in pediatric nutrition  you can apply for jobs abroad .But the process is a bit long and there are various eligibility criteria's for doing job abroad. There are different criteria based on different countries as well so you will have to research on them as well.If you feel you are eligible for all the criterias of working in a foreign country you can get jobs in fields like Child Nutrition progaram, fitness club manager, food quality and health examiner,or in  nursing homes as well.