Kids suck their thumbs because it’s comforting and calming. Your preschooler probably practiced this habit while she was still in the womb and perfected it as an infant.
Now she turns to her thumb when she’s tired, scared, bored, sick, or trying to adjust to challenges such as starting daycare or preschool. She may also use her thumb to help her fall asleep at bedtime and to lull herself back to sleep when she wakes up in the middle of the night.
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