Tight space during pregnancy or delivery: A pregnant parent with a small pelvis is more likely to have a baby with plagiocephaly.Premature babies also move their heads less often, or they may be in a respirator where they have limited movement. Premature birth: A baby born early has a softer skull that is more likely to have an unusual shape.Certain health conditions : Some infants may stay in one position if their physical development is delayed or if tight neck muscles limit their range of motion.Resting position: Plagiocephaly is most common in babies who spend long periods without changing positions in a crib, car seat or baby carrier.A baby’s head is soft and can flatten if it is in the same position for long periods of time. Plagiocephaly develops before or after birth due to repeated pressure on one area of the skull. Back-sleeping lowers the risk of Sudden Infant Death Syndrome (SIDS), but it increases the risk of positional plagiocephaly. This is when providers started to tell parents to put babies to sleep on their backs. Plagiocephaly that needs treatment has been more common since the 1990s. Because the skull bones are still forming in infancy, head shape often corrects itself within the first 6 weeks of life.
Many children are born with heads that are slightly uneven, and parents and providers may not notice an unusual head shape early on.
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