Simple Joysby Carter's Baby Girls' Fleece Footed Sleep and Play, Pack of 2

Do the purple flowers/gray dot set have a 2 way zipper, or zipper from bottom to top?

Looking to send in November. The baby will be 5 months and she is average size right now. 3-6 or 6-9 months?

Does the purple floral/gray hearts set have zippers or snaps? Picture shows snaps, product description says zipper.

Does the onesie has mitten included?