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A stackable plastic booster seat apparatus with a body having a set of four corner cylindrical portions. A right foot having cylindrical portions engages two of the corner cylindrical portions and a left foot engages the other two corner cylindrical portions. The body includes a back with a lumbar s

A stackable plastic booster seat apparatus with a body having a set of four corner cylindrical portions. A right foot having cylindrical portions engages two of the corner cylindrical portions and a left foot engages the other two corner cylindrical portions. The body includes a back with a lumbar support, a seat with a safety bump and a downward and rearward slope such that a child tends to sit properly in the apparatus away from the safety bump and against the lumbar support.

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1. A molded booster seat apparatus for a child, comprising: a) a molded base to support the molded booster seat apparatus relative to an environmental surface, with the molded base having at least three points defining a plane that lies generally level with said environmental surface;b) a molded bac

1. A molded booster seat apparatus for a child, comprising: a) a molded base to support the molded booster seat apparatus relative to an environmental surface, with the molded base having at least three points defining a plane that lies generally level with said environmental surface;b) a molded back for the back of the child and comprising a lumbar support;c) a molded seat for the buttocks of the child, wherein said molded seat comprises: i) a front portion that confronts an inner knee of the child, a rear portion that confronts said molded back, a right portion, and a left portion;ii) a safety bump between the front and rear portions and between the left and right portions, with said safety bump comprising a rise projecting upwardly from said front, rear, right and left portions, and with said safety bump confronting said front portion of said molded seat;iii) wherein the front portion is disposed at a greater distance from said plane than said rear portion such that said right, left and rear portions angle rearwardly and downwardly such that gravity tends to draw the buttocks of the child rearwardly away from the safety bump and such that gravity tends to draw the back of the child against the lumbar support and thereby retain the child safely in the booster seat;andd) wherein said molded back has a height and a width, wherein said lumbar support has a height, a width, and a depth, wherein the height of the lumbar support is less than the height of said molded back, and wherein the width of the lumbar support is less than the width of the molded back. 2. The molded booster seat apparatus of claim 1, wherein said molded back further comprises a non-lumbar portion, with the lumbar support projecting forwardly of the non-lumbar portion, and with the non-lumbar portion extending about the entirety of the lumbar support. 3. The molded booster seat apparatus of claim 1, wherein said lumbar support includes a middle portion and an upper portion, wherein a depth of the middle portion of said lumbar support is greater than a depth of the upper portion of said lumbar support, and wherein said lumbar support tapers rearwardly and upwardly from the middle portion to the upper portion of the lumbar support. 4. The molded booster seat apparatus of claim 1, wherein said lumbar support includes a middle portion and an lower portion, wherein a depth of the middle portion of said lumbar support is greater than a depth of the lower portion of said lumbar support, and wherein said lumbar support tapers rearwardly and downwardly from the middle portion to the lower portion of the lumbar support. 5. The molded booster seat apparatus of claim 1, wherein said molded seat further comprises a molded right side and a molded left side, with the molded right side having an upper edge and with the molded left side comprising an upper edge, with each of the upper edges running into the molded back at a junction, with the lumbar support having an upper portion above said junction, and with the lumbar support having a lower portion below said junction. 6. A molded booster seat apparatus for a child, comprising: a) a molded base comprising a set of four corner portions;b) a molded back for the back of the child;c) a molded seat for the buttocks of the child;d) a first foot and a second foot, with the first foot engaging two of the corner portions at the same time, with the second foot engaging two of the corner portions at the same time, with the first foot and with the second foot supporting the molded booster seat apparatus relative to an environmental surface, and with each of the first foot and the second foot being disengageable from the corner portions;e) wherein the set of four corner portions includes a right front corner portion, a right rear corner portion, a left front corner portion, and a left rear corner portion, with the first foot engaging at the same time the right front corner portion and the right rear corner portion, and with the second foot engaging at the same time the left front corner portion and the left rear corner portion;f) wherein each of said corner portions comprises an at least partially cylindrical inner surface, and wherein said first foot and said second foot each comprises a first end and a second end, with each of the first and second ends comprising an at least partially cylindrical outer surface for engaging said at least partially cylindrical inner surface of one of said corner portions whereby said first foot and said second foot engage the corner portions in a stable manner; andg) wherein each of said corner portions comprises an at least partially cylindrical outer surface, with each of the first and second ends of said first foot and second foot comprising an at least partially cylindrical inner surface that confronts said at least partially cylindrical outer surface of one of said corner portions whereby one molded booster seat apparatus is stackable and stable upon a second molded booster seat apparatus identical in structure to said molded booster seat apparatus. 7. A molded booster seat apparatus for a child, comprising: a) a molded base comprising a set of four corner portions;b) a molded back for the back of the child;c) a molded seat for the buttocks of the child;d) a first foot and a second foot, with the first foot engaging two of the corner portions at the same time, with the second foot engaging two of the corner portions at the same time, with the first foot and with the second foot supporting the molded booster seat apparatus relative to an environmental surface, and with each of the first foot and the second foot being disengageable from the corner portions;e) wherein one of a) said molded body and b) said foot includes at least two slots and wherein said other of a) said molded body and b) said foot includes at least one slot, wherein said at least two slots are oriented vertically relative to each other, wherein said at least one slot is alignable with each of said at least two slots, and further comprising a first piece engageable between one of said at least two slots and said at least one slot of the first foot and molded body and a second piece engageable between one of said at least two slots and said at least one slot of the second foot and molded body such that the molded body is adjustable in height;f) wherein each of said first and second pieces is a key and wherein each of said slots is formed in a shape of a keyhole;g) wherein said key comprises: i) a knob;ii) a shaft extending axially from the knob; andiii) a pair of wings extending from the shaft, with the wings extending away from each other, with each of the wings including an inner edge that abuts and locks against an inner surface of said first or second foot, and with each of the wings including a rounded edge to facilitate entry of the key into the keyhole; andh) wherein said keyhole comprises a circular opening and a pair of rectilinear openings extending away from each other and away from the circular opening. 8. A molded booster seat apparatus for a child, comprising: a) a molded base comprising a set of four corner portions;b) a molded back for the back of the child;c) a molded seat for the buttocks of the child;d) a first foot and a second foot, with the first foot engaging two of the corner portions at the same time, with the second foot engaging two of the corner portions at the same time, with the first foot and with the second foot supporting the molded booster seat apparatus relative to an environmental surface, and with each of the first foot and the second foot being disengageable from the corner portions;e) wherein one of a) said molded body and b) said foot includes at least two slots and wherein said other of a) said molded body and b) said foot includes at least one slot, wherein said at least two slots are oriented vertically relative to each other, wherein said at least one slot is alignable with each of said at least two slots, and further comprising a first piece engageable between one of said at least two slots and said at least one slot of the first foot and molded body and a second piece engageable between one of said at least two slots and said at least one slot of the second foot and molded body such that the molded body is adjustable in height;f) wherein said first and second pieces are engaged to first and second respective straps, with said first strap having a first buckle end and said second strap having a second buckle end such that the first buckle end of the first strap extending from said first foot is engageable to the second buckle end of the second strap extending from said second foot. 9. The molded booster seat apparatus of claim 6, wherein the molded back comprises right and left sides tapering upwardly and inwardly and front and rear faces tapering upwardly and inwardly, and with the molded back including a receptor for a molded back of a second molded booster seat apparatus identical in structure to said molded booster seat apparatus. 10. The molded booster seat apparatus of claim 6, wherein each of said first and second foot includes a rear end, with said rear end including a guide for a molded back of a second molded booster seat apparatus identical in structure to said molded booster seat apparatus, whereby said molded booster seat apparatus and said second molded booster seat apparatus are stackable. 11. The molded booster seat apparatus of claim 6, a) wherein each of said first and second foot includes a rear end, with said rear end including a guide for a molded seat of a second molded booster seat apparatus identical in structure to said molded booster seat apparatus; andb) wherein said molded back includes a molded receptor that receives at least a portion of a molded back of a second molded booster seat apparatus identical in structure to said molded booster seat apparatus, whereby said molded booster seat apparatus and second molded booster seat apparatus are stackable. 12. The molded booster seat apparatus of claim 6, wherein said first foot and said second foot each comprises: a) a side portion extending to and between the first and second ends; andb) a lower portion extending to and between the first and second ends, with said lower portion comprising a flange extending outwardly at generally a right angle to said side portion to stabilize said foot and therefore stabilize said molded booster seat apparatus, with said flange extending to and between the first and second ends. 13. A molded booster seat apparatus for a child, comprising: a) a molded base supporting the molded booster seat apparatus relative to an environmental surface;b) a molded back for the back of the child;c) a molded seat for the buttocks of the child;d) wherein said molded base further comprises a right front corner portion, a right rear corner portion, a left front corner portion, and a left rear corner portion, with each of the corner portions comprising an at least partially cylindrical outer surface and an at least partially cylindrical inner surface such that said outer corner portions of a first molded booster seat apparatus can confront inner corner portions of a second molded booster seat apparatus identical in structure to said molded booster seat apparatus and such that said outer corner portions of said second molded booster seat apparatus can confront inner corner portions of a third molded booster seat apparatus identical in structure to said molded booster seat apparatus and said second molded booster seat apparatus, whereby said molded booster seat apparatus, said second molded booster seat apparatus, and said third molded booster seat apparatus are stackable. 14. The molded booster seat apparatus of claim 13, wherein the molded back comprises right and left sides tapering upwardly and inwardly and front and rear faces tapering upwardly and inwardly, and with the molded back including a receptor for a molded back of a second molded booster seat apparatus identical in structure to said molded booster seat apparatus. 15. The molded booster seat apparatus of claim 13, wherein each of said at least partially cylindrical inner and outer surfaces extend from 180 degrees to 360 degrees in a generally horizontal plane.