Babies do all sorts of funny things while they are growing in utero, and sometimes they can become twisted in sub-optimal positioning, stuck in a specific place (ahem, like under your ribs - ouch!), or squished due to lack of space (as is the case with multiples and conditions like low amniotic fluid). And then of course, they twist and rotate and twist some more as they make their way down and through the birth canal, sometimes getting stuck on the way out and needing assistance from forceps, vacuum, hands, or even a c-section.
All the twisting and rotating and general stuckness can lead to straining and tightening of the fascia, which is a thin but strong layer that lies on top of (superficial) to the muscles and protects our entire body - from the muscles to all the nerves and organs below them, as well as the muscles themselves. All this tightness can present as tongue, lip, cheeks ties (which can affect feeding, latch, reflux, colic, and more) or tightness of the body (ie. torticollis) and can pull bones out of alignment and compress nerves, which can lead to other complications like pain, stiffness, discomfort and more.
Babies are meant to be snuggly and pretty loose, almost melting into you when being held....but often times this is not the case. Body tightness can affect a variety of things like latch, posture while feeding, reflux, colic, constipation, torticollis, plagiocephaly (or flat head syndroms), difficulty with tummy time and may also delay baby's ability to move and meet their developmental milestones such as rolling, crawling, getting into a sitting position and eventually standing and walking.