没必要这口吻吧。哈哈

https://www.simplypsychology.org/sensorimotor.html

 

“The second substage is the stage of primary circular reactions. The baby will repeat pleasurable actions centred on its own body.

For example, babies from 1 – 4 months old will wiggle their fingers, kick their legs and suck their thumbs. These are not reflex actions. They are done intentionally – for the sake of the pleasurable stimulation produced.”

所有跟帖： 

• 其实不止是for Pleasure -alohamora- ♀ (482 bytes) () 05/27/2019 postreply 15:52:13

• 哈哈哈，你可别把楼主吓坏了，每个小孩都不同，或许 -七彩奶油- ♀ (191 bytes) () 05/27/2019 postreply 15:59:40