Task: Categorize the tweet's emotional expression, classifying it as either 'neutral or no emotion' or as one or more of the specified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that reflect the tweeter's state of mind.
Tweet: Having a baby born too soon is #lifechanging 6 years on and it feels like only yesterday #sad #happy #angry #emotionalrollercoaster
This tweet contains emotions: 
anger, joy, sadness