When does babies eye color change permantely?

The first year: By 6-12 months of age, a baby's iris has reached its final color. There are those who may go a little longer, and those with hazel eyes can appear to change between brown and green, but generally, the pigmentation has reached its full level by the first year.

Around 12 months: The level of pigmentation of the iris is what detemines eye color. It reaches stable levels in children usually by 12 months but can take up to 3 years. Light colored eyes may seems to change with different lighting conditions despite having reached a stable level of pigmentation.