FIG. 1 is a perspective view of frame for baby stroller showing my new design; FIG. 2 is a right side elevational view thereof; FIG. 3 is a top plan view thereof; FIG. 4 is a front side elevational view thereof; FIG. 5 is a bottom plan view thereof; FIG. 6 is a left side elevational view thereof; FIG. 7 is a rear side elevational view thereof; and, FIG. 8 is another perspective view thereof.