"We're celebrating our child being with us for a whole year! " "Guess who's the lucky ONE! " "He's the ONE we're having a party for. " "She's turning one, but we don't want to be alone for this birthday party. "
How time Flies! Our little angel is already One years Old. Please join us in celebrating this joyous event. Stop on by and watch the cake Fly! We look forward to seeing you there!
Consider: You are cordially invited to attend the first birthday of [name]. It will be held [date] at [time]. We'll be celebrating at [place]. We sincerely hope that you and your family will be able to come and help us celebrate this special occasion. You can also go less formal.