The ornamental design for a pacifier for babies, as shown and described.
FIG. 1 is a front elevation view of a pacifier for babies, showing my new design;
FIG. 2 is a left view thereof;
FIG. 3 is a right view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a rear elevation view thereof; and,
FIG. 7 is a perspective view thereof.
In the drawings, the equal-length broken lines depict portions of the pacifier for babies that form no part of the claimed design. The dash-dot-dash lines define the boundaries of the claim.