Until the age of Chinuch children do not have to be careful to avoid doing so.
Advice for child above Chinuch who sucks his thumb: Explain to him the importance of weaning off the sucking and place a sock over his hand, or band aid over his finger, before he goes to sleep. It will only take a few days to break the habit.
- Piskeiy Teshuvos 4:8; See also Admur Basra 4:2; Divrei Yatziv 1:1; Tzitz Eliezer 21:20; Mishneh Halachos 7:1; See Ashel Avraham 4 that possibly until the age of Bar Mitzvah one does not have to be careful in the above. ↩
- Based on Ashel Avraham ibid one may be lenient to allow even children above Chinuch to suck their thumb during sleep. [Piskeiy Teshuvos 4 footnote 105] Nevertheless, as explained in the previous Q&A, it is best to try to wean the child off unless it is a case of need. ↩