My girl is 3 yrs and 2 months old, recently we noticed her hairs drop more than usual. Is it due to the foods? She likes seaweed..

Could be a problem. Ingestion of excess amounts of seaweed can suppress the function of the thyroid and cause problems. A low functioning thyroid gland is called hypothyroidism. It is associated with hair loss. It is reversible by not eating seaweed. You should talk with your doctor.