An adjustable child carrier includes waist belt, a main body, shoulder straps, side attachment tabs, and thigh supports. The side attachment tabs provide lower attachment points for the shoulder straps. The thigh supports cooperate with a seat center portion to form an adjustable bucket seat configurable in a plurality of bucket seat configurations adapted to ergonomically support a child in a corresponding size range in a spread squat position. The upper end portions of the thigh supports can be selectively coupled to the side attachment tabs at multiple mid-section width setting locations and the lower end portions of the thigh supports can be selectively coupled to the waist belt at multiple base width setting locations. The thigh supports are adjustable to set a mid-section width of the adjustable child carrier and a base width of the adjustable bucket seat.