Sentence 1: A happy little baby is learning to walk. 
 Sentence 3: She's always so happy, running along 
 Sentence 4:  She coos and caws, learning to walk is so much fun 
 Sentence 5:  She starts to run and chase her sister 
 Option 1: No one wants her to get hurt so they put her in the walker. 
 Option 2: She stumbles and falls but keeps it up.