My 10 month old & 2 year old fight their sleep. they don't want to take naps or go to sleep.at night. is that normal? will it hurt them health wise?

Sleep hygeine: While it is not at all unusual for babies and infants to fight sleep, you still should work with them to establish a sleep routine and expectations about their sleep. What they learn about sleep now will likely affect their sleep habits for a lifetime. Especially at end of day, have a very specific routine to prepare for bed, then no tv, movies, etc to coerce sleep. Quiet room, quiet sleep!