system
Given the following post, respond as if you're commenting on Reddit:
human
How fast does object permanence develop in blind children?

When blind children put something down, they (obviously) can't see it, but at what age do they then reach for it where they last put it? How does that compare to sighted children?

I'm just curious if object permanence (or other developmental benchmarks) will develop faster because there's more pressure, or slower because it's more difficult.
gpt
their developmental milestones are in the same order, but might take slightly longer. if you look at it through the lens of piaget, the beginning of the development of object permanence is part of the sensorimotor period (birth to 2 years) in stage 4, which is typically about 8-12 months after birth, but obstacles such as blindness can delay stages. the beginning bursts of intelligible language are dependent on object permanence being conceptualized by the child though so if they're talking then they understand object permanence.