Can You Develop An Allergy To Prawns Even Though They Have Not Affected You Before?

I havnt ate prawns for a good few months until today and i was wonderin if i could of devloped an allergy to them please help?

Is It Okay To Use Hypoallergenic Infant Formula Even Though My 2 Month Old Baby Have No Allergies In Milk?

we still don’t know if he have allergies though but we are using a hypoallergenic formula.. Is this okay?