ds (12 wks) has recently nearly mastered thumb sucking, after many weeks of random flailing around. Still generally has atleast one finger wedged in his eye though. 
I think it is comfort rather than hunger as he does it before and after feeds. Will also do it during! Pulling off and inserting thumb instead of nipple but also trying to wiggle a thumb or finger in alongside nipple.
Thing is, how do I tell at night when he is actually hungry? Used to wake 2 or 3 times a night but the last week has been loads more. Usually feed him back to sleep at night but he sometimes self settles with thumb. Don't want him going hungry if its milk he actually wants but maybe he is happy with the thumb and just sucking on me to drift back off? Should I try just leaving him to find his thumb at night?
Or could more frequent waking be growth spurt!? Still feeds about every 4 hours in the day, screams if I offer more often or to feed for longer. But could this frequent pulling off be trying to stimulate supply?
(Weight gain fine, plenty of wet and dirty nappies)
Any thoughts? TIA