Breastfeed a Better Youngster: the BABY Study (BABY)

Mother-infant Signalling During Lactation Following Late Preterm and Early Term Delivery: An Investigation of Physiological, Psychological and Anthropological Factors

This research will investigate different aspects of the 'signalling' between mother and infant during breastfeeding in a stressful situation following late preterm and early term delivery, when breastfeeding is often challenging. The researcher will conduct a single-blinded randomised controlled trial in Chinese mothers who deliver a late preterm infant (LPI; 34 0/7-36 6/7 weeks of gestation) and mothers who deliver a early term infant (ETI; 37 0/7-37 6/7) and plan to exclusively breast-feed.This study will investigate the role of the milk and infant gut microbiome as a potential 'signal' in this process. A relaxation intervention (meditation tape) will be used to reduce stress levels in mothers who are expressing breast-milk or breastfeeding their infant (born at 34 0/7-37 6/7 weeks completed gestation). This study will investigate whether lower levels of stress in the mother result in more successful and effective breastfeeding, leading to improved infant outcomes (better growth, longer sleep duration and reduced crying).

Participants will be recruited while they are in the maternity hospital. A baseline assessment will be conducted during the 1-week postpartum home visit, with another study visit at 8 weeks after delivery. After obtaining written informed consent, subjects will be randomly assigned to either the intervention arm or control conditions (standard management). Participants will be told that the aim of the study is to investigate factors that may make breastfeeding easier for mothers with a LPI and ETI, so they can breast-feed for longer. They will not be told about the randomisation until the end of the study, as this knowledge would most likely lead to mothers in the control group using some form of relaxation therapy. Background characteristics of mothers and their early feeding experiences will be recorded. Participants can choose to complete the questionnaires on paper or online in their own time after the study visit. A breast milk sample will be collected pre-feed and infant anthropometry will be assessed by a trained nurse pre-feed at each home visit. Feed duration will be noted by the trained nurse. Stool samples of infants who were born vaginally will be collected by a trained nurse at baseline and at 8-weeks. At 3-month and 6-month postpartum, there will be a telephone contact to the participants for follow-up. Participants will be invited to complete the infant questionnaires again on paper or online in their own time.

Breastfeeding, Breastfeeding, Exclusive, Infant Behavior, Psychological Stress, Breast Milk Expression, Infant Development

Participants in this arm will be asked to use the relaxation therapy during the feed at least once a day. Participants will be given a diary to record when it is used. Participants will be encouraged to use the tape as often as they find it helpful.

The tape used in this study is based on a meditation CD designed for breastfeeding mother (Menelli, 2004). The recording will be transcribed and translated into Chinese language by a certified yoga therapist.

Measurement for maternal stress will use the Cohen's Perceived Stress Scale (PSS). The PSS is a 14-item psychological self-rating scale for measuring the perception of stress on a scale of five, from 0 (never) to 4 (very often).

Measured using the revised Rothbart Infant Behaviour Questionnaire (RIBQ) at 2 months of age. The RIBQ is a 7-point Likert scale, from 1 (never) to 7 (always). Three major dimensions will be used for the assessment of infant temperament; surgency/extraversion, negative affectivity and orienting/regulation.

Measured by 3-day infant behaviour diary (average mins per day spent in each behavioural state). The diary consists of a time scale for 72 hours, which is divided into 15 minutes segments, and has five categories of behaviour: Sleeping, Awake and content, Fussy, Crying and Feeding.

Measured using the Baby Eating Behaviour Questionnaire (BEBQ) at 2 months of age. It consists of 18 items designed to measure four traits: "enjoyment of food" (4 items), "food responsiveness" (5 items), "slowness in eating" (4 items), and satiety responsiveness" (5 items). The mothers in this study will be asked to rate all items based on a scale from 1 (never) to 5 (always).

The energy content will estimated from the milk volume measurement provided by Mid-infrared milk analyser in ml and kcal/100ml

Inclusion Criteria: Primiparous mother with singleton pregnancy who is breastfeeding her late preterm infants Infant is singleton born at 34 0/7-37 6/7 weeks of gestation. Mother and infant are generally healthy (free of serious diseases that can affect breastfeeding or nursing infant, or energy balance of the infant). No current involvement in other research studies that can potentially affect any of outcome measures. Exclusion Criteria: Infant with serious underlying or chronic disease* Mothers who smoke Infant receiving any medication regularly

Yu J, Wells J, Wei Z, Fewtrell M. Effects of relaxation therapy on maternal psychological state, infant growth and gut microbiome: protocol for a randomised controlled trial investigating mother-infant signalling during lactation following late preterm and early term delivery. Int Breastfeed J. 2019 Dec 16;14:50. doi: 10.1186/s13006-019-0246-5. eCollection 2019.