I know it isnt necessary but will it hurt their hair or skin if i bathe my 1 and 2 yr old every night?

Bathing: The American Academy of Pediatrics recommends bathing no more than 3 times a week. Frequent bathing especiallywith soaps can dry out the skin and shampooing may contribute to cradle cap

No : There are several advantages of bathing - young or old alike. It cleanses the skin from the daily grime and toxins that accumulate in the pores. It makes one smell nice, it's relaxing and can induce a good night's sleep. It's fun and it's cheap. So go on bathe your toddlers every night.