No, cover amount and term duration typically cannot be changed. If you want to increase the amount, you can purchase an additional policy.
However, in the event of marriage or childbirth, some policies, including ICICI Pru iProtect Smart also give an option of top-up upto a certain limit. If you get a top-up, you won’t have to go through the medical process again. Your premium will also be increased according to the extra cover availed of.