Primary hypotheses

1. The use of a relaxation tape by breastfeeding mothers that will be given starting at week 2 postpartum, will result in : i) reduced maternal stress and anxiety ii) the production of a higher volume of breast milk iii) lower milk cortisol concentrations iv) favourable effects on infant behaviour (less crying, more sleeping) v) higher milk intake by the infant vi) more optimal growth, specifically higher lean mass and lower fat mass (body composition)

Secondary hypotheses (i) Infant temperament/behaviour and gender influence milk and energy intake and hence early growth and body composition (ii) Non-nutrient factors in breast milk (hormones including ghrelin and leptin) influence infant behaviour and feeding patterns and hence infant growth and body composition.

Inclusion Criteria:

Primiparous mother with singleton pregnancy Infant is singleton and born at term (37-42 week of gestation) Infant birth weight of >2500 g (5,5 pounds or 5 pounds and 8,2 ounces) Mother and infant are generally healthy (free of serious illness that can affect breastfeeding or nursing infant, or energy balance of the infant).

No current or recent involvement in other research studies that could potentially affect any of outcome measures.

Mother speaks and understands either English only or English and Malay (some questionnaires are in English)

Exclusion Criteria:

Mother or baby has a major illness that affects nursing or breastfeeding, or affects energy balance of the infant.

Mother smokes Mothers who do not exclusively breastfeed their infant

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