My mother in law wants me to feed my boy this. He's 7 months old. Is this safe and what are the benefits? How can we cook this?

Anchovies are high in protein, iron and vitamins. They should be given after eight months of age. Alternatively, you can cook stock with them or grind them into powder form for porridge. I gave my son anchovies powder in his porridge at around six months of age. Do check for allergies when introducing new food to baby.