A highchair for seating a child, the highchair comprising: a seat having a bottom support and a back support, the bottom support including a center post extending there from; a frame attached to and supporting the seat at a height, the bottom support of the seat being adjustable between a plurality of fixed seat position channels on the frame, wherein the seat position channels extend such that a rear-most end of each seat position channel terminates progressively forward moving top to bottom; and a tray detachably coupled to the center post of the seat wherein the tray further includes a center post channel including pins; and a tray latching mechanism for connecting the tray to the center post and capable of retaining the tray in one of a plurality of attached positions and a release position, wherein the tray latching mechanism comprises a single actuator, which is a single handle attached to the tray for adjusting the latching mechanism between three settings including: a locked setting where the tray is secured to the center post and prevented from movement; an adjust setting where the tray is secured to the center post and capable of sliding movement between a plurality of latching points, which are a plurality of tray position notches; and a release setting where the tray is released from attachment to the center post, wherein the handle is directly linked to the pins such that movement of the handle results in movement of the pins, wherein the center post includes a tray guide at the upper end of the center post, and within the tray guide is a retention channel which includes the plurality of tray position notches, in the release setting the handle is in a release position and the tray can be properly placed into contact with the top of the post, in the adjust setting the handle is in the adjust position and the tray is secured to the post by the pins simultaneously moving to enter the retention channel, and in the locked setting the handle and the pins are moved to a locked position in which the pins enter one of the tray position notches preventing the tray from further movement in the guide. a seat having a bottom support and a back support, the bottom support including a center post extending there from; a frame attached to and supporting the seat at a height, the bottom support of the seat being adjustable between a plurality of fixed seat position channels on the frame, wherein the seat position channels extend such that a rear-most end of each seat position channel terminates progressively forward moving top to bottom; and a tray detachably coupled to the center post of the seat wherein the tray further includes a center post channel including pins; and a tray latching mechanism for connecting the tray to the center post and capable of retaining the tray in one of a plurality of attached positions and a release position, wherein the tray latching mechanism comprises a single actuator, which is a single handle attached to the tray for adjusting the latching mechanism between three settings including: a locked setting where the tray is secured to the center post and prevented from movement; an adjust setting where the tray is secured to the center post and capable of sliding movement between a plurality of latching points, which are a plurality of tray position notches; and a release setting where the tray is released from attachment to the center post, wherein the handle is directly linked to the pins such that movement of the handle results in movement of the pins, wherein the center post includes a tray guide at the upper end of the center post, and within the tray guide is a retention channel which includes the plurality of tray position notches, in the release setting the handle is in a release position and the tray can be properly placed into contact with the top of the post, in the adjust setting the handle is in the adjust position and the tray is secured to the post by the pins simultaneously moving to enter the retention channel, and in the locked setting the handle and the pins are moved to a locked position in which the pins enter one of the tray position notches preventing the tray from further movement in the guide.