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