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The authors of this interesting article, Marschik et al, may be very interested in similar research published in the early 1990s.
It is written up in 'book form': author - Alessandra Piontelli, title - 'From Fetus to Child: an observational and psychoanalytic study' (publisher: Routledge, London, 1992).
In it she describes her research: she observed eleven foetuses in the womb, using ultrasound scans; and followed them up at home until up to four years old.
Like Marschik et al, her central finding is that there is a remarkable continuity of behaviour before and after birth.
Of interest also is a much earlier comment, attributed to Sigmund Freud (in 'Inhibitions, symptoms and anxiety') recorded on the frontispiece: 'there is much more continuity between intra-uterine life and earliest infancy than the impressive causera of the act of birth would have us believe'.
Thus, it would seem the behavioural continuity reported by Marschik et al may not be unique - and may even prove, if researched further, to be the norm, not the exception
many thanks for publishing this interesting article,
Dr M Norrie