infantile myasthenia

例句：

1. 1. The baby's infantile behavior is quite adorable.
   这个宝宝的幼稚行为非常可爱。
2. 2. The infantile instinct to explore is natural for young children.
   对小孩子们来说，探索的本能是自然的。
3. 3. The child's infantile cries are a reminder of the bond between parent and child.
   孩子的啼哭提醒了父母和孩子之间的联系。