
This book via
lmnop is 'dedicated to parents and children celebrating their shared experience'.
Things like thumb-sucking. Of which I did partake up to a very late age. I'm talking over 12 years here. Apparently I was born sucking my thumb. Somehow I managed to avoid buck teeth, though that and being told I'd suck my thumb clean off where just two of many reasons I was told I should stop over those years. I even had that horrible tasting stuff to stop biting nails painted on a few times. But old habits die hard and it was with age I grew out of mine. It always intrigued me why adults, from family to strangers, found it so necessary to warn me of the evils of my habit. It's not like I was sucking on a crack pipe.
My son sucks his two fingers (all the time!) and I love that it provides him with the same comfort my thumb gave me.