All my kids were born with blue. No-one in our families has blue except for DH's sister.

DD1's electric blue eyes have stayed that way. DD2 got indigo and they're just getting more intense.
DS's greyish eyes got paler until her was 3 earlier this year. Now they have started to go the same green as mine (Yay!!) Everyone told me that since they hadn't changed by three they wouldn't....I'm so grateful they are.

There are people that say 6 weeks, 6months, 1year etc. It's just a waiting game really.