fig4 illustrates a dangerous problem associated with prior art child car seats , which was discovered by the one of the applicants . in fig4 , the child has grabbed chest clip 8 and has slid it down shoulder straps 3 a and 3 b so that it is no longer appropriately positioned over the child &# 39 ; s chest , but instead is near buckle 6 . the act of sliding chest clip 8 down shoulder straps 4 puts the child in a position of increased danger . for example , the child has wiggled her shoulders so that her upper body is no longer covered by shoulder straps 3 a and 3 b . at this point , if the automobile is involved in an accident , the child could potentially suffer head and / or neck injuries , which may include skull fractures , broken neck and jaw fractures , as well as injuries resulting from what is known as “ seat belt syndrome ”. seat belt syndrome has been characterized as a collection of injuries specifically resulting from passengers who were only wearing lap belts upon the impact of a vehicle crash . injuries typically include : severe abdominal injuries , fractures of the lumbar spine and serious closed head and facial injuries - or even death because the upper body is no longer restrained . furthermore , from the position shown in fig4 it is possible for the child to climb out of the 5 - point harness system , placing her in even greater danger . if the child climbs out of the car seat and the car is involved in an accident , even a relatively minor accident , the child could suffer severe life threatening injuries . fig5 shows a preferred embodiment of the present invention . child safety seat 10 includes 5 - point harness system 12 . in 5 - point harness system 12 , chest clip 8 has been replaced with chest clip 18 and buttons 19 have been attached to shoulder straps 3 a and 3 b . in the first preferred embodiment , buttons 19 function as chest clip stops in that they stop the child from sliding chest clip 18 downward or upward , enabling chest clip 18 to remain appropriately positioned over the child &# 39 ; s chest . because chest clip 18 stays positioned over the child &# 39 ; s chest , the child is prevented from escaping from the 5 - point harness system and remains securely protected by the car seat harness system . a front view of preferred chest clip 18 is shown in fig7 a and a rear view is shown in fig7 b . in a preferred embodiment , clip half 61 a can be removed from shoulder strap 3 a and clip half 61 b can be removed from shoulder strap 3 b . fig6 shows of chest clip 18 and buttons 19 . as stated above , buttons 19 prevent the child from sliding clip 18 downwards or upwards . if the child attempts to move chest clip 18 , the chest clip will contact the buttons 19 and the movement of chest clip 18 will be blocked by the buttons . preferably , buttons 19 should be of sufficient thickness and diameter to prevent chest clip 18 from sliding over the buttons . a preferred portion of chest clip 18 located just underneath the cover of chest clip 18 is shown in dotted line in fig6 . fig8 - 11a show a preferred method for attaching buttons 19 to the shoulder straps . in fig8 , hole 14 has been punched through shoulder strap 3 a . in fig9 , upper part 19 a of button 19 has been positioned over hole 14 . lower part 19 b has been positioned under hole 14 . upper part 19 a preferably includes ductile plastic barb 33 . in fig1 , barb 33 has been pushed through hole 14 and partially pushed through the hole in lower portion 19 b . in fig1 a , barb 33 has been pushed the rest of the way through the hole in lower portion 19 b . barb 33 is preferably ductile enough so that it can be squeezed through the hole in lower part 19 b yet sufficiently firm so that it prevents lower portion 19 b from separating after barb 33 has been completely pushed through the hole . in the preferred embodiment shown in fig5 - 7b , buttons 19 are permanently attached to shoulder straps 3 a and 3 b in a manner similar to that shown in fig8 - 11b . as the child grows ( or if a larger child uses the car seat ), it will most likely be necessary to adjust the length of shoulder straps 3 a and 3 b and the length of hip straps 4 a and 4 b . also , it may be necessary to adjust the position of chest clip 18 so that it remains appropriately positioned over the child &# 39 ; s chest . because buttons 19 are intended to be permanently attached , an adult will need to remove chest clip 18 from shoulder straps 3 a and 3 b prior to repositioning chest clip 18 . as shown in fig7 b , clip half 61 b of chest clip 18 includes openings 61 b 1 and 61 b 2 . likewise , clip half 61 a includes openings 61 a 1 and 61 a 2 . to remove clip halves 61 a and 61 b from the shoulder straps , an adult slides straps 3 a and 3 b out through the openings . for example , fig5 shows a 3 year old child strapped in child car seat 10 . chest clip 18 is positioned as shown . prior to placing a larger child ( for example , a 6 year old child ) into the car seat , the adult will need to increase the length of shoulder straps 3 a and 3 b and hip straps 4 a and 4 b . accordingly , chest clip 18 has been raised so that it is positioned between a different set of buttons 19 , as shown in fig7 c and 7d . the position of chest clip 18 has been adjusted so that it will now be appropriately positioned over the larger child &# 39 ; s chest . fig1 shows infant car safety seat 50 having 3 - point harness system 51 . 3 - point harness system includes shoulder straps 52 a and 52 b and crotch strap 53 . an infant grows very fast and will commonly double their birth weight in the first 4 to 5 months of life . to accommodate the infant &# 39 ; s fast growth , the shoulder straps of car safety seat 50 may need to be adjusted every 2 to 3 weeks . because the alignment between relative positions on strap 52 a and 52 b shifts as the straps are being lengthened it is preferable to remove buttons 19 prior to adjusting the lengths of straps 52 a and 52 b . then , buttons 19 should be reattached after the lengths of straps 52 a and 52 b have been adjusted . for example , fig1 shows a simplified top view of shoulder straps 52 a and 52 b of car seat 50 . in fig1 , an adult has removed buttons 19 . a preferred method for removing buttons 19 is shown in fig1 b . hard flat tool 65 is inserted between strap 3 a and backing 19 b . backing 19 b is then pried off . then , as shown in fig1 , an adult has reached behind car seat 50 and has pressed button 55 of latch 56 . this releases compressive pressure on strap 52 b and has allowed the adult to pull strap 52 b in the direction indicated by the arrow in fig1 to lengthen shoulder straps 52 b and 52 a . in fig1 , the adult has appropriately adjusted the position of chest clip 8 and has reattached buttons 19 in a fashion similar to that described above in reference to fig8 - 11a . although the above preferred embodiments specifically showed how the present invention can be utilized for child safety seat harnesses , it can likewise be utilized for a variety of other applications . for example , buttons 19 ( or a similar stop ) can be utilized for but not limited to preventing sliding of a chest clip for the following devices : an infant / toddler front carrier , a stroller , a grocery cart infant seat , a highchair , an infant / toddler backpack carrier , car booster seats , a jogging stroller . there are adult applications for the present invention as well . for example , automobile race car drivers usually utilize shoulder straps as part of their safety harnessing system . buttons 19 attached to the shoulder straps of an automobile racer can prevent unwanted sliding of a chest clip . this idea could also apply to outdoor recreational safety gear as well as safety restraints used by medical personnel . in another preferred embodiment , buttons 19 include a design on the front that is decorative and visually appealing to enhance the attractiveness of the car seat . in another preferred embodiment , chest clip 18 ( fig6 ) includes cover 87 ( fig1 ) that preferably includes the logo of the seat supplier . in another preferred embodiment , snaps are utilized as chest clip stops . for example , fig2 shows chest clip stop halves 156 a and 156 b snapped to shoulder straps 3 a and 3 b . snaps 157 are attached to shoulder straps 3 a and 3 b . in fig2 , the parent has unsnapped chest clip stop half 156 a from shoulder strap 3 a . the parent then also unsnaps chest clip stop half 156 b in a similar manner . in fig2 , the parent has snapped chest clip stop halves 156 a and 156 b back onto shoulder straps 3 a and 3 b in different positions . fig2 shows a side view of chest clip stop half 156 a snapped onto strap 3 a . although the above - preferred embodiments have been described with specificity , persons skilled in this art will recognize that many changes to the specific embodiments disclosed above could be made without departing from the spirit of the invention . for example , although the above preferred embodiments showed a plurality of chest clip stops on the shoulder straps , it would be possible to prevent or limit the sliding of the chest clip by utilizing just one chest clip stop . also , although the above preferred embodiments showed buttons 19 attached to shoulder straps 3 a and 3 b , it would be possible to attach other objects to the shoulder straps to prevent the chest clip from sliding . for example , fig1 shows safety pin 80 attached to shoulder strap 3 a . safety pin 80 would stop the sliding of chest clip 8 or 18 in a manner similar to buttons 19 . preferably , a plurality of safety pins would be utilized and they would be attached above and below the chest clip in a fashion similar to buttons 19 shown in fig1 . also , a simple stop in the general shape of a hair barrette can be designed to operate as a chest clip stop . for example , fig1 shows chest clip stop 97 clamped down onto shoulder straps 3 a and 3 b . also , fig1 shows a front view of chest clip stop 97 opened and fig2 shows a front view of chest clip stop 97 clamped down onto shoulder straps 3 a and 3 b . with chest clip stop 97 , there is no need to modify clip halves 9 a and 9 b shown in fig3 a . also , it should be noted that a variety of objects that penetrate the shoulder straps other than a button or a safety pin could be utilized . some of the many possibilities include a paper clip , a thumb tack , or a pin . if a thumb tack or a pin is utilized the sharp end should be covered with a backing . for example , a preferred backing would screw onto the sharp end of the pin or thumb tack . also , in addition to the hair barrette shown in fig1 - 20 , other devices that wrap around the shoulder straps can also be utilized as chest clip stops . for example , fabric can be tied tightly around the shoulder straps . or duct tape wrapped around the shoulder straps can function as a chest clip stop . also , it would be possible to run the shoulder straps through a plurality of buckles and utilize the buckles as chest clip stops . also , it would be possible to attach to the chest clip an object designed to minimize or prevent the sliding or movement of the clip . this object would serve as a redundancy feature that would operate to prevent the sliding and movement of the chest clip in addition to the chest clip stops . for example , the chest clip could include teeth such as teeth on a hair barrette ( see fig1 - 20 ), or a non - skid type of rubber or plastic . also , in another preferred embodiment , shoulder straps 3 a and 3 b each include a plurality of prefabricated holes ( such as hole 14 shown in fig8 ). the parent then may then install , remove and replace chest clip stops of whatever form is appealing to the parent ( for example , buttons , pins with backings , buckles , safety pins , hair barrettes , etc .). also , it should be noted that it would be possible to attach buttons 19 in a variety of ways . for example , buttons 19 can be sewn onto shoulder straps 3 a and 3 b with a needle and thread at the exact position that the parent desires . then , if it ever becomes necessary to adjust the location of the chest clip , the parent merely need to just cut the thread and move the buttons to the desired location and sew them onto the straps again . by sewing buttons onto the shoulder straps and then re - sewing them at different locations , there is no need to modify clip halves 9 a and 9 b shown in fig3 a . also , above in the specification in reference to fig1 - 15 it is described how buttons 19 are removed when the length of shoulder straps 52 a and 52 b are adjusted and the position of chest clip 18 is adjusted . it should be recognized that it would also be possible to attach a plurality of buttons 19 to shoulder straps 52 a and 52 b . then , to adjust the length of shoulder straps 52 a and 52 b the buttons can remain attached to the shoulder straps and the chest clip would be removed and reattached appropriately in a fashion similar to that described above in reference to fig7 a - 7d . therefore , the attached claims and their legal equivalents should determine the scope of the invention .