赤ん坊

1. Origins, structure, and basic meaning

• Structure: 赤ん坊 (あかんぼう) is a person noun for a very young baby or infant.
• Basic usage: 眠っていた赤ん坊が泣く makes the waking baby the acting subject, while 赤ん坊を毛布で包む makes the infant the object a mother wraps in a blanket.

2. Common pitfalls and similar expressions

• Crying subject and protected object
  • 赤ん坊が marks the child beginning to cry, whereas 赤ん坊を receives the mother’s wrapping action. 毛布で identifies the means used, not the baby.