Background: Nutrition in the first 1000 days between pregnancy and 24 months of life is critical for child health, and exclusive breastfeeding is promoted as the infant's best source of nutrition in the first 6 months. Caffeine is a central nervous system stimulant occurring naturally in some foods and used to treat primary apnoea in premature babies. However high caffeine intake can be harmful, and caffeine is transmitted into breastmilk. Aim: To systematically review the evidence on the effects of maternal caffeine consumption during breastfeeding on the breastfed child. Method: A systematic search was conducted to October 2017 in MEDLINE, EMBASE, Web of Science, CINAHL, and Cochrane Library. The British Library catalogue, which covers doctoral theses, was searched and PRISMA guidelines followed. Two reviewers screened for experimental, cohort, or case-control studies and performed independent quality assessment using the Newcastle-Ottawa scale. The main reviewer performed data extraction, checked by the second reviewer. Results: Two cohort, two crossover studies, and one N-of-1 trial were included for narrative synthesis. One crossover and two cohort studies of small sample sizes directly investigated maternal caffeine consumption. No significant effects on 24-hour heart rate, 24-hour sleep time, or frequent night waking of the breastfed child were found. One study found a decreased rate of full breastfeeding at 6 months postpartum. Two studies indirectly investigated caffeine exposure. Maternal chocolate and coffee consumption was associated with increased infant colic, and severe to moderate exacerbation of infant atopic dermatitis. However, whether caffeine was the causal ingredient is questionable. The insufficient and inconsistent evidence available had quality issues impeding conclusions on the effects of maternal caffeine consumption on the breastfed child. Conclusion: Evidence for recommendations on caffeine intake for breastfeeding women is scant, of limited quality and inconclusive. Birth cohort studies investigating the potential positive and negative effects of various levels of maternal caffeine consumption on the breastfed child and breastfeeding mother could improve the knowledge base and allow evidence-based advice for breastfeeding mothers. Systematic review registration number: CRD42017078790.

Objective: The aim of this research was to explore mothers' lived experience of early bonding with their twins.Background: Research has suggested that the process of bonding with twins may differ from that of bonding with singletons. However, there is limited research exploring this experience from the mother's perspective.Method: An IPA study involved six participants in semi-structured interviews.Results: Two superordinate themes emerged; 'Twin guilt and shame' and 'I missed out … they miss out'. Results suggested the experience of bonding with two infants simultaneously generated guilt for the mothers, who at points felt that they and their infants had missed out and had had to adapt.Conclusion: The experience of bonding with twins can be complex and take longer than anticipated, with mothers reporting the experience as being different from their expectations. Having a greater understanding and information about the complexities of bonding with twins would be beneficial for both mothers and professionals working with them.