Somewhere between the feeding schedule and the sleep tracking, it's easy to miss just how much is happening behind those unfocused newborn eyes. None of this is essential reading the way car seat safety or allergen timing is, but it's the kind of thing that makes the early months feel a little more magical once you know what's actually going on.

Eye colour isn't set at birth, and it takes longer than people think

Most babies' eye colour settles somewhere between 6 and 9 months, though smaller changes can keep happening into toddlerhood, sometimes as late as age 3. Eye colour is polygenic, meaning it's controlled by multiple genes working together, not a simple one-gene-from-each-parent situation, which is why two brown-eyed parents can still end up with a blue-eyed baby.

Vision develops in stages, not all at once

How a baby's vision comes into focus, month by month
  • Newborn to 1 month: sees clearly only up to about 12 inches, roughly the distance from your face during feeding, no coincidence there
  • 2 months: starts perceiving colour, red and green first
  • 3 months: broader colour range, depth perception starts developing, reaching for objects begins
  • 5-8 months: colour vision sharpens further, eye-hand coordination develops alongside crawling
  • By 12 months: vision is close to adult-level, can recognize faces and objects across a room

Object permanence, the milestone behind the "why does peekaboo work"

Object permanence is simply the understanding that something still exists even when you can't see it, you, a favourite cup, the family dog. Before this develops, out of sight genuinely means out of mind. It typically starts emerging between 4 and 8 months, with babies beginning to search for partially or fully hidden objects, and becomes fully developed by around 18-24 months.

This is also why peekaboo works so well Before object permanence develops, your disappearing and reappearing face is genuinely surprising every single time. Once it starts developing, that same game becomes a way for your baby to practice and reinforce the concept, which is part of why babies at this stage find it so endlessly funny.

Why this stage sometimes comes with more tears

Once object permanence develops, separation anxiety often follows closely behind, your baby now understands you still exist when you leave the room, which is exactly why leaving the room suddenly becomes a bigger deal than it used to be. It's a sign of real cognitive development, not a step backward, even though it can feel that way at 6am.