The ornamental design for a handle grip for a baby bottle, as shown and described.
FIG. 1 is a perspective view of a handle grip for a baby bottle, showing my
new design, the broken line showing of the baby bottle is for illustrative
purposes only and forms no part of the claimed design;
FIG. 2 is a side elevational view thereof, the opposite side being a mirror
image thereof; and
FIG. 3 is a top plan view thereof, the opposite bottom plan view being a
mirror image thereof.