What age can baby use a silicone feeder?

I have a 3 month old baby. I bought a silicone feeder that says it can be used from 3 months up. I know nutritionally they don’t need anything but milk until 4-6 months. My baby is showing interest in food though so can I put small pieces of fruit in the feeder for taste? I can’t imagine he would swallow enough to take away from the amount of milk he drinks. Would it be okay?