How much fish should a 12 months old eat every week? how much will be too much?

You decide.: It is recommended to introduce fish after one year of age and many sources recommend to wait until 3 years. Besides being allergenic for an infant, whose immune system, 80% gut-associated, is not fully developed, there are also toxicity concerns. The bigger the fish, the more mercury it contains. Shellfish living in polluted coastal waters are exposed to many chemicals and should be avoided.

fish: Depends on the fish and quality of fish. Problem is that most fish contains mercury and contaminants that are dangerous. Best fish is wild salmon (not commercially grown salmon) which is free of contaminants. Most tuna has some mercury especially albacore so avoid this, .