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First Online: 9 March 2020

Compliance with Ethical Standards

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: The authors declare that no relevant conflicts of interest influenced the nature of the present research investigation.

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Further, measures were taken to minimize any risks, harms, and/or discomforts. Risks, harms, and/or discomforts were minimized in various ways. First, additional session attendance was not requested of the participant in the event of a cancellation. Second, direct parent training sessions were terminated contingent on the child becoming visibly distraught or agitated (e.g., crying) for no more than 30 s maximum, based on the parent’s reported level of comfort at the onset of treatment. Last, if the parent requested to end or withdraw for any reason, the parent training sessions would have been terminated immediately.

: Informed consent was obtained from the parents of the infants who participated in the study. Specifically, if the parent’s child met the characteristics for participation in the study, and the parent provided consent-to-participation forms for both him- or herself and his or her child (via parental and child consent forms), the child would then begin the assessment procedures. The primary investigator was available and willing to answer any questions that the parent may have had regarding the study and his or her child’s participation throughout every session. Further, the consent form stressed that the parent may withdraw his or her child’s participation at any time and that all participation is purely voluntary in nature.