All babies are born with the instinct to root and suck—it is, of course, what helps them feed even seconds after birth. That instinct can cause them to also suck on their fingers or thumb during non-feeding times, too, because it can be soothing and help them feel secure. If they get into the thumb-sucking habit, most…
from Lifehacker https://ift.tt/3wocVQE
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