The ornamental design for the base for baby bottle, as shown and described.
1. Base for Baby Bottle
1.1 is a front perspective view of a base for a 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 right plan view thereof;
1.5 is a left plan view thereof;
1.6 is a top plan view thereof; and
1.7 is a bottom plan view thereof.
The broken line showing of the base for baby bottle in views 1.2-1.5 are included for the purpose of illustrating a baby bottle as unclaimed portions of the base for baby bottle and form no part of the claimed design.
The broken line showing of the base for baby bottle in views 1.1, 1.6 and 1.7 are included tor the purpose of illustrating unclaimed portions of the base for baby bottle and form no part of the claimed design.
The dot-dot-dashed broken line showing of the base for baby bottle in view 1.7 is included for the purpose of showing the boundary of claimed subject matter extending up to but not including the dot-dot-dashed broken line.