The ornamental design for the sleeve for baby bottle, as shown and described.
1. Sleeve for baby bottle
1.1 is a front perspective view of a sleeve for baby bottle showing our new design;
1.2 is a front plan view thereof;
1.3 is a rear plan view thereof;
1.4 is a left plan view thereof;
1.5 is a right plan view thereof;
1.6 is a top plan view thereof; and,
1.7 is a bottom plan view thereof.
The portions of the sleeve for baby bottle shown in broken lines are included for the purpose of illustrating unclaimed portions of the sleeve for baby bottle and form no part of the claimed design.