Psychological support will be standard for all families. In a first consultation, psychologist and family will decide about long-term psychological support. They will have at least 3 follow-up consultations during hospital stay and one before discharge; specific psychological interventions will be provided. The aim of the interventions is to re-establish emotional stability and improve the ability of parents to cope with the situation, to prevent parental and family adaptive disorders and child developmental disorders. Support focus on screening for psychological disorders. Techniques include family-centred, holistic interventions (e.g. activating parental resources and coping, crisis intervention, stabilization techniques etc.). Parents will receive outpatient psychological support.

during hospitalization, the lactation consultant will be involved more frequently than during standard care. Breastfeeding support will take a structured approach and will be performed in close collaboration with both parents. The main aims of structured breastfeeding support are strengthen parent-child bonding. Infants will be breastfed according to their needs. Parents will become competent in meeting their child's nutritional needs. After discharge, parents may schedule outpatient breastfeeding consultations.

physiotherapeutic interventions will also be structured. The physiotherapist will make an assessment during hospitalization, and decide which physiotherapeutic interventions are necessary. Each family will learn how to handle their premature child in everyday life, based on the child's developmental stage, in a single consultation.

social workers will closely collaborate with the APN within the transitional model. They will be involved with every family and will assist the APN in establishing a network with social and medical services within and outside the clinic. They will also support families in coping with daily life and with their integration into society, family and work. Furthermore, they will give advice on social security issues and on asserting claims as well as clarify financial possibilities.

music therapy with premature infants and their parents creates a new dimension of contact, and helps stabilize the child and supports their development through music. It also reduces the anxiety of parents, and enhances self-efficacy and makes them more sensitive to their child 74,75, thus enhancing the parent-child relationship. In standard care, music therapy is offered only during hospitalization. In the new model of care, after NICU discharge, the program will offer 10 follow-up sessions at the family's home or in the music therapists' private practice.

the APN will contact and involve other health care professionals, like the family's paediatrician, the outpatient midwife, the community health care nurse or the mother and father counselling as soon as need becomes evident. The APN will help set up meetings between health care professionals and the family, and will keep them up-to-date on the family's situation.

interprofessional roundtable meetings with health care professionals involved in the care of a specific family will be held every two weeks. The meeting is aimed at developing consensus on the best possible support in the care of preterm infants and their families. Parents will be invited to participate in these meetings, led by the APN. The meeting will focus on two family situations, and then determine and initiate supportive interventions in collaboration with the parents.

The APN will participate in comprehensively planning individual discharge, coordinating services, consulting with other healthcare professionals, assessing needs on a case by case basis, and coaching the family from birth to 6 months after discharge from the NICU. The APN will provide the Newborn Behavioral Observation (NBO), an infant-centred and family-focused method for building relationships, to parents and children, during and after hospitalization. The NBO helps sensitize parents to their infant's competencies and capabilities, teaching them to read their infant's signals and understand their behaviours. It promotes positive interactions between parent and preterm infant. The APN will also offer telephone support and follow-up Visits at home after discharge.

Parenting stress will be measured with the Parenting Stress Index Short Form (PSI-SF), a self-reporting questionnaire that contains 36 items rated on a 5-point Likert Scale (strongly agree to strongly disagree). Overall parenting stress is indicated by the total stress score. Parents report their level of agreement with 36 items that fall into three subscales (12 items each subscale): Parental distress, parent-child dysfunctional interaction and difficult child. The PSI-SF includes a defensive responding scale (seven items from the Parental Distress scale) that indicates the degree to which the parent might be attempting to deny or minimize problems.

The raw scores will need to be converted into percentile scores. For each sub-scale a score which falls between the 15th and 80th percentile is considered typical. High scores are those at or above the 85th percentile considering high parenting stress.

Tool to measure parenting self-efficacy (TOPSE) is an instrument of 48 statements that encompasses eight dimensions of parenting. The german version of the TOPSE, was reduced to 30 items that encompass five dimensions of parenting (emotion and affection, empathy and understanding, pressures, self-acceptance and learning and knowledge). The items are rated on an 11-point Likert scale.

Growth Status including weight in kg, height in cm and head circumference in cm will be continuously assessed from medical records.

Infant temperament, behaviour and self-regulation abilities will be measured used the Infant Behavior Questionnaire-Revised (IBQ-R) short-form at the end of the 6-month study period. IBQ-R consists of 91 items that span 14 scales (Activity Level, Approach, Cuddliness, Distress to Limitations, Duration of Orienting, Falling Reactivity, Fear, High Intensity Pleasure, Low Intensity Pleasure, Perceptual Sensitivity, Sadness, Smiling and Laughter, Soothability and Vocal Reactivity).

Quality of life will be assessed with the Visual Analog Scale (VAS). Parents will mark a spot along a line from 1 indicating worst possible quality of life to 10 indicating best possible quality of life.

Will be evaluated at the end of the study period with a Visual Analog Scale (VAS). Parents will mark a spot along a line from 0 indicating no study burden to 10 indicating highest possible study burden. The VAS will be part of the 6-month questionnaire.

Sleep patterns will be continuously assessed from medical records.

Self-regulation abilities will be continuously assessed from medical records.

Financial data will be collected for costs incurred during hospital stay as well as post hospital discharge. For the duration of hospital stay the investigators will extract data on length of hospital stay, readmission rates, reason and length of re-hospitalization and all the arising costs from the hospital records. For post-discharge costs, data will be extracted from invoices to patients and a simple questionnaire. The investigators will base cost-effectiveness analyses and cost results on different metrics of outcome measures (Depressive Symptoms, Anxiety, Post-traumatic stress disorders, Parent Child Interaction, Perceived Self-efficacy, etc.).

Infant Nutrition Management including description of what kind of Nutrition the child is getting, in which way the child get's the Nutrition (e.g. breastfeeding) and the nutritional challenges parents are confronted with will be continuously assessed from medical records.