The ornamental design for an infantcarrier with a seat, as shown and described.
FIG. 1 is a perspective view of an infant carrier with seat;
FIG. 2 is a rear elevation view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a perspective view of the infant carrier with seat shown with the seat compartment open.
Any shading and cross-hatching shown in the drawings are not features of the design, but are utilized to illustrate the surface contours of the convertible infant carrier design in the drawings.
The broken lines depict portions of the article that form no part of the claimed design.