a baby, an infant (human or animal)

赤ちゃん: baby

細い: thin, narrow

火退, 逆焼, 野火, 燹: a backburn: a controlled fire deliberately set in the path of a wildfire to create a firebreak by removing combustible material

birth

be born

straight, not bent

直ぐ: immediately, right away, soon / 直ぐ: quick to / 直ぐ: right next to, right close by

(obsolete) 過ぐ: classical form of modern 過ぎる (sugiru, “to go through, to go past; to exceed”)

(obsolete) 挿ぐ: classical form of modern 挿げる (sugeru, “to connect or affix one thing to another, especially by passing something through something else”)