Peanut allergy is not common in our part of the world. My obstetrician never asked me to refrain to eat any particular food. My son was breastfed. When he was about 5 months old and we tried formula, he showed a bad reaction. We had a skin test done and he showed a severe reaction to both cow's milk and wheat, so the allergologist asked us to refrain from giving him anything with milk/dairy products and wheat until he turned two, when he hopefully would have outgrown it. And he did! Now he can eat almost anything. I guess this works to a certain extent.

But to avoid foods just to avoid an allergy even if it were not proven yet, that is not very practical or sound.