If you touch a hamsters babies before you are allowed to, (2-3 weeks usually) the mother will eat it.
about 6 to 8 weeks the sooner the better.
you touch the baby's when they have all their hair.
guinea pigs are not tlike hamsters after a day or too you can hold on hamsters will eat their young but guinea pigs wont
when you see the hamster or guinea start to have hair on there body or start to see or maybe younger(i touched it when it started to have hair and i put it in a place the mother will never look)
Never, hamsters can only be touched after they're completely weaned.
about 5 months
no, the mom might abandon them or eat them if you do.
If you want it to have the chances of being eaten or abandoned, go ahead.
yes
yes you can
As soon as they are born