Congrats on the kids ! I love kids (could'nt eat a full one though badum tish)
Having spare alum is no harm , you'll probably drop one or the kids will and they smash into tiny tiny pieces.I have a couple spare for that very reason.
Plus you can try using them as deoderant , and maybe you won't like rubbing the same one on your face and pits/nads.Though some people do. Probably the kind of people who'd rub their face in their pits/nads if they could.You need to be very flexible to do it ,or you could do yourself a mischief ,a very painful mischief .Brings tears to my eyes thinking about it. Very painful indeed.