Children's Swivel Chair

FIG. 1 is a forward left perspective view of a children's swivel chair, showing my new design; FIG. 2 is a rear, right, bottom perspective view thereof; FIG. 3 is a front elevational view thereof; FIG. 4 is a rear elevational view thereof; FIG. 5 is a left side view thereof; FIG. 6 is a right side view thereof; FIG. 7 is a top plan view thereof; FIG. 8 is a bottom plan view thereof; FIG. 9 is a partial enlarged view of FIG. 1 ; and, FIG. 10 is a partial enlarged view of FIG. 2 . The broken lines depict portions of the children's swivel chair that form no part of the claimed design. The dot dash dot broken lines depict bounds of the enlargements and form no part of the claimed design.