Babies start sucking their thumbs or fingers before birth, around the 20th week of pregnancy. This reflex calms them down, especially at bedtime [1].
Should I let my baby suck their fingers?
Yes. Most kids do this: 82% in the first six months, 73% up to two years, and 48% until age four. Only 12% continue until seven years, and 2% into adolescence [2]. You don't need to worry about weaning unless it continues past age four when it can affect teeth [2].
Exclusive breastfeeding up to six months might help satisfy the need for sucking and help give up the habit earlier [1].
Is it bad for their fingers?
Yes, it can be. Babies' skin can get raw and swollen if they keep sucking on the same finger [2]. A pacifier can be a solution that the baby can wean from more easily than fingers.
Should I distract my baby if they suck their thumb when nervous?
Babies often get nervous when their parents are away and suck their fingers to calm down. It's normal; babies are good at self-soothing. Holding, patting, and reassuring can help reduce thumb-sucking. But babies also suck fingers when they're tired to relax and fall asleep faster. In that case, you can offer a pacifier [1].
Photo: shutterstock
