A number of families of children with a particular genetic syndrome report that their babies were full-term but they were told that they had to be approximately 6 weeks early based on underdevelopment of plantar creases, ears, nipples etc. is this possible, unusual, or simply a mistake?
As you mentioned that those were infants with genetic disorders so the neurodevelopmental stage maybe hard to compare to average term infants.
There are many genetically inherited syndromes where the infant is smaller and more immature developmentally than gestation would suggest. In addition infants of poorly controlled gestational diabetes othen behave up to 2 weeks more immaturely than expected. They tend to have more breathing problems, jaundice and low blood glucose in particular.
I have also seen this type of newborn. But most of the cases the LMP date was wrong. But I do agree with Robert Simon.
I believe it is possible that it could be early for special cases such as irregular menstrual cycle of the mother and LMP was calculated wrong. Also have to consider the mother's lifestyle, like smoking, alcohol consumptions, or pre-existing conditions.
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