Thumb sucking question

Jordanjkmr

LO has been fairly easy to read and is my third, so things have been going fairly smoothly.

Now he's found his thumb (my first thumb sucker, so cute!!) and I've been thrown for a loop. Sometimes he sucks so ferociously I think he must be hungry or upset. 

For those of you who have a thumb sucker now or did in the past, at the age of 3 months did you find that sucking on their thumb indicated they were hungry or tired or in need some comfort, or did it seem to just be something they did without rhyme or reason?

reils500

With my LO it seems like he's entertaining himself. When he's upset he flays his arms & can't get his hands to his mouth.