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Why Do Girls Put Their Thumb in Their Mouth?

Published in Child Development 2 mins read

It's not unique to girls; children, in general, put their thumbs in their mouths as a self-soothing mechanism.

Understanding Thumb Sucking in Children

Thumb sucking is a common behavior in infants and young children. According to dentaldepotarizona.com, children often discover that thumb sucking provides comfort, and they may engage in this behavior when they feel:

  • Hungry
  • Frightened
  • Tired
  • Bored

Thumb Sucking as a Coping Mechanism

Beyond basic needs, thumb sucking can also be a way for young children to manage emotional distress. It may be used to cope with:

  • Separation anxiety
  • Difficulty falling asleep

Why Some Children, Including Girls, Suck Their Thumbs

The act of sucking, whether it's on a thumb, fingers, or a pacifier, can be naturally calming and comforting for young children. It’s not a gender-specific behavior; girls, like boys, might use thumb-sucking as a way to self-soothe. It is important to note that not every child engages in thumb sucking and those that do may have varying frequencies and durations of this behaviour.

When to Be Concerned about Thumb Sucking

While thumb sucking is usually a harmless behavior in early childhood, it’s important to monitor:

  • Frequency and Duration: Frequent and long periods of thumb sucking may cause dental issues.
  • Age: If thumb sucking persists beyond the age of 4 or 5, it is usually recommended to seek advice from your dentist and/or pediatrician.
Reason Explanation
Self-Soothing Provides comfort when hungry, tired, frightened, or bored.
Emotional regulation Helps with separation anxiety and falling asleep.


Thumb sucking is a normal childhood behaviour and should not necessarily be a reason for concern but be mindful of the possible dental consequences.

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