赤ちゃん

1. Origins, structure, and basic meaning

• Structure: 赤ちゃん is read as あかちゃん and means “baby”.
• Basic usage: It refers to a neighboring baby laughing and reaching toward a picture book.

2. Common pitfalls and similar expressions

• 赤ちゃんが笑う / 赤ちゃんは手を伸ばす
  • It is an everyday, affectionate term. The baby is the subject in 赤ちゃんが笑う and 赤ちゃんは手を伸ばす.