YOU SAID:
the baby went and fell because he doesn't know how to walk
INTO JAPANESE
赤ちゃんは歩き方がわからないので行ったり来たりしました
BACK INTO ENGLISH
The baby went back and forth because he didn't know how to walk
INTO JAPANESE
赤ちゃんは歩き方がわからなかったので行ったり来たりしました
BACK INTO ENGLISH
The baby went back and forth because he didn't know how to walk
You've done this before, haven't you.