2y baby ate 1 tsp nutella containing soy lecithin and no allergy at all, this means no favism? Don't 've to make sure with test? Can safely eat beans?

About favism... Surviving a meal of Nutella is not a test for favism (G6PD deficiency). The G6PD test is a simple blood test that any lab can do. The result is a percentage (for example: 20% would mean the person has only 20% of the G6PD that an average normal person has). If deficient, broad beans such as fava beans are a no-no. People may want to avoid other legumes and beans; some beans are worse than others.