Babies enjoy touching, exploring and manipulating all kinds of toys or household objects.
You can prepare some soft toys, rough objects, things that make sound like rattle to put into the box and let your baby put his/her hand to take the object out.
This activity benifit the child motor skill. When they take out the object by their hand, covering the object my their palm and squeezing it into their fist. (用手掌握物後緊握著) It also allow the child to feel different texture of the objects and it acts as a kind of sensorial education. Moreover, when your child grow up you can apply more language, for example parents can use their language to describe more about the objects which the baby takes.
I did this activity with Abbie when she reached 7.5 months old.
I put various kinds of toys inside the empty tissue box.
I encourage Abbie to put her hand into the box and let the feel what inside the box and grab something out from the box(it happens naturally, you don’t have to teach just provide the opportunity to the baby).
You can have the child try to use both hands to do so.