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The purpose of this cross-fostering study was to investigate neonatal survival following exposure of pregnant rats to atosiban (1-deamino-2-d-Tyr(OEt)-4-Thr-8-Orn-oxytocin), an oxytocin antagonist. Atosiban was administered subcutaneously from days 15 to 20 of gestation at 300 mg/kg/day, and controls received vehicle alone. Parturition was observed at 30 min intervals throughout the period that births were occurring. There was no effect of treatment on number of pups born or neonatal viability. Within 1 h of birth, litter size was standardised to five males and five females, followed immediately by cross-fostering either between or within groups. Offspring from treated mothers reared by control mothers had normal survival and weight gain. There was poor survival and weight gain in offspring from control mothers reared by treated mothers. There was clear evidence that lactation was impaired in the treated females, leading to the conclusion that poor neonatal survival in offspring reared by treated mothers was attributable to a failure of milk let-down. [Copyright &y& Elsevier]

• Services are more likely to attract and retain youth if they are co-designed. • Services are likely to be more engaging for youth if they are personalised. • Practitioners working with youth need to be caring, open, attentive and genuine. • The service system needs to make it easy for youth to engage with services they need. • Parents/carers and peers can support young people's engagement in services. Addressing youth violence is a public health priority given its prevalence, harms and costs to society. Services designed to prevent or reduce youth violence exist. However, their effectiveness depends on youth engaging with them. To our knowledge, there is no overview of the evidence on how to support this process. This article therefore aims to identify key messages from the scientific literature about how services can best engage youth at risk of involvement in violence. We undertook a rapid review of the evidence on youth engagement in services, prioritising English language studies published from 2010- which included youth aged 10–14 years and were conducted in high-income countries. Key messages for practice relate to 12 themes: co-designing services with youth; personalising provision to youth needs and preferences; recruiting staff with suitable experience and qualities; developing positive practitioner-participant relationships; nurturing an enabling service system; creating an inviting service environment; designing interesting activities and service content; encouraging peer engagement; securing parent/carer support; exploring opportunities for service integration; proactively including marginalised groups; and exploiting digital opportunities. While we could identify key messages from the literature, more prospective empirical research is needed to test the effectiveness of strategies in isolation and combination. This includes exploring what works for whom and in what circumstances. [ABSTRACT FROM AUTHOR]