Yes you can use it but ensure to change in every 6-8 hours or whenever it get dirty.

Preferably not. Use cotton nappies or half pants for your child. You might need 2 dozen of them as child may pass urine and stool very frequently and thus much of a work on your side. Too frequent changing and also washing them frequently too for reuse. Diapers are responsible for rashes on perianal region (ie around the buttocks). If wet for too long can lead to fungal infection too. If this is too exhausting for you then can use diapers at night so atleast you get a better sleep. Prefer eco friendly diapers but for child doesn't make much difference.