"Sweet Baby" is a very lovely name. Here are some suggestions for matching couples' online names:

1. candyman

2. Candy Baby

3. Dessert Prince/Princess

4. Candy lovers

5. Baby

6.sugar-coated angel

7.sweetheart candy

Candy lover

9. Honey lovers

10. Sugar-coated baby

Please note that the couple's online name is a personal choice, so you must choose a name you like.