I was going crazy trying to open the child-proof caps on these bottles of plant food (due to my arthritic fingers) that I was thinking of decanting them into another container once someone had opened them for me.  However, I found this easy hack to help open child-proof cap son YouTube the other day.  There are probably a few more hacks out there but  this one worked for these type of caps.  The caps have two parts to them so this hack joins the two together using  thumb tacs.  When I used only one tac the twisting motion to remove the cap just pushed the tac out.  This was solved once a piece of black tape was put over the top of it.  Or you can put in two tacs – one opposite the other –  and this works without the use of the tape.  On larger caps you can try and lever off the top part of the cap from the lower one and just keep the one part on the bottle or jar.  I couldn’t lever these ones off.    But this hack works!