Why not
it is something i enjoy and unless i force them to NOT read comics...they probably will read comics and watch cartoons just like any other child
manga is just comics so i dont see the problem

when they are old enough to read
maybe not hand them R-18 manga when they are 6-7yo
bcoz as a parent you become prude and start to have morals
and forget what you looked at,read,wanked off at as a child and how early you started
and that you actually turned out ok in the end