“When do babies discover their hands or understand when hands are something they have?”

Babies realize they have hands at around 2-3 months of age. Between 2 and 4 months they will see a toy, and try to get it with their hands. At the beginning, they won’t be able to get it, then they might swipe at it, occasionally hitting it. Slowly, as they develop eye-hand coordination, their accuracy improves. And roughly at 6 months, your baby will be able to do something with the toy, like shaking or banging it.
It is very important to remember that each baby develops at a different pace. Some babies will discover their hands before they reach 2 months, others bang on 2 months, and others a bit later. Keep an eye on your child’s development but do not stress too much about it. If you are ever worried, take him to his doctor.
I hope this information is useful!
Love,
Ana