Peanut butter allergy ..?

Tanya

So my son had his 4 month check up and his dr is such a very good Dr let me tell you. I have never had any problems or concerns I’ve always asked him questions and he’s very knowledgeable. He used to be my dr as a kid and now he’s all 4 of my kids dr 18+ years later. Any who he’s amazing… so my youngest son had his 4 month drs appt and his dr suggested that we give him peanut butter now so that he doesn’t develop the allergy of being allergic. None of my kids are allergic to peanuts or nuts of any kind nothing. Idk what to do… should I give him peanut butter ..? I never did this with any of my other kids..?