Stock Photo: Sad Child Thinking About His Problems. Emotional Child Portrait. Nervously Kid Bits His Fingernail. Bad Kids Habit

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child bite little boy worried baby background people hand school concept hair dark black children face kid cute person young thinking stress human anxiety emotional mouth childhood finger preschool fingernail expression biting nails unhappy one nervous sitting alone sad thoughtfulness thinks nail anxious habit toddler ashamed problem feelings decisions bulling problems portrait nervously bits fingernail bad kids habit family concept