system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do newborns learn to keep their eyes open?
gpt
Most babies will tend to open their eyes more if they are held in an upright position (this is called the "doll's eye" reflex). Their vision is very out of focus at first, but they can see things within 6-10 inches away, and they are naturally fascinated by human faces, which is why it's so important to interact with even tiny newborns. Newborns sleep a ton during the first few weeks of life, so they do spend a good chunk of time with their eyes closed, but often they really enjoy being held upright and staring at mom or dad's face! Sight is the last sense to develop in newborns, so while they can often hear extremely well, their eyesight is very poor in the beginning. As their vision gets better and they are more able to focus their eyes on different objects, they keep their eyes open for longer periods of time and will often become fascinated looking at different colors and types of movement.