If your family doesn't do 2nd-baby showers, I don't think you need to make it clear that this isn't one. Saying, "come meet the baby" and leaving out "shower" is enough.
I'm not sure why you need to say anything about snacks--wouldn't people simply expect you to have them anyway? That makes it awkward somehow--as though it implies that they might think you wouldn't, or it's a big "draw" (reason to come).
I'd just say,
Come meet the baby! Saturday, the 12th of Never, from 2 to 4pm.